Cannot scroll on touchpad - Samsung Rv511-a01 Laptop

I trust that you understand that scroll bars are only visible if more than 1 page is to be displayed. If you have magnified a particular page, the scroll bar may be outside the view of the screen - on the right side, Scroll to the left until you see the right border.
Perhaps you are referring to the touchpad.
The scroll feature on the touch pad is not visible. You enable the touchpad by tapping twice on the upper left corner of the touchpad. A lite will appear in that corner when the touchpad is ON.
Then the scrolling feature is enabled on the right side of the touchpad. Simply run your finger up and down the right side of the touchpad. For more information, refer to the User Guide here:
http://h10032.www1.hp.com/ctg/Manual/c02102005.pdf

The scrolling feature on a laptop touchpad can take some getting used to, which causes some users to disable the feature.
Whether scrolling was intentionally turned off or never enabled on the laptop, it can easily be turned on from the "Mouse Properties" menu.

Click "Start" (or the Windows logo button in Vista and Windows 7) and select "Control Panel." Select "Classic View" in Vista if not already displayed. Double click "Mouse."
You may also access "Mouse Properties" in Vista and Windows 7 by clicking the Windows logo and typing "Mouse" in the search box.
Press "Enter," then click "Mouse" when the search is finished.
Select the "Hardware" tab.
Select the touchpad and click "Properties."
Click "Change Settings" if the settings aren't displayed.
Click the "Device Settings" tab in Windows 7 and select the touchpad.
Click "Settings."
Click "Virtual Scrolling" in the touchpad properties window.
Click the boxes next to each "Enable Scrolling" box and click "OK." Scrolling is now turned on for your touchpad.

Step 1:
The scrolling feature on a laptop touchpad can take some getting used to, which causes some users to disable the feature. Whether scrolling was intentionally turned off or never enabled on the laptop, it can easily be turned on from the "Mouse Properties" menu.

Click "Start" (or the Windows logo button in Vista and Windows 7) and select "Control Panel." Select "Classic View" in Vista if not already displayed. Double click "Mouse." You may also access "Mouse Properties" in Vista and Windows 7 by clicking the Windows logo and typing "Mouse" in the search box. Press "Enter," then click "Mouse" when the search is finished. Select the "Hardware" tab. Select the touchpad and click "Properties." Click "Change Settings" if the settings aren't displayed. Click the "Device Settings" tab in Windows 7 and select the touchpad. Click "Settings." Click "Virtual Scrolling" in the touchpad properties window. Click the boxes next to each "Enable Scrolling" box and click "OK." Scrolling is now turned on for your touchpad.

Toshiba laptop computers use multi-function touchpads, which often have software features added to the touchpad manufacturer's basic package. If your Toshiba laptop's touchpad won't scroll but its other functions are working, you may simply need to adjust your settings. If the problem occurs suddenly, try restarting your computer before resorting to other methods. Sometimes the addition of new software or other features can interfere temporarily with the touchpad driver, interrupting the scrolling feature. If a simple restart does not restore your touchpad's scrolling feature, check its properties through the control panel. The exact options for doing so will vary by laptop model and operating system.

Click "Start," then "Control Panel." Navigate to "Mouse," which may be under "Hardware and sound" or a similar category, depending on your operating system. Select the "Touchpad" tab in the "Mouse" window. This tab will also list the touchpad manufacturer, most often Synaptics on Toshiba computers. If you have more than one built-in pointing device, as is the case with the touchscreen model Toshiba Portege series, choose the "Hardware" tab and select your touchpad, then click "Settings." Select "Properties," "Settings," "Advanced" or the similar option on your system. Click the box next to "Enable scrolling" if this option is available. For Synaptics touchpads, you may have a list of options; click the arrow to the right of "Scrolling" to open the scrolling list and select one-finger or two-finger scrolling to access the specific features. Click to enable any scrolling features you desire, then select "Adjust scrolling region" or the similar option, if available. Drag the scrolling region to cover a larger portion of the touchpad if you want to ensure you can scroll easily. Click "Ok" to apply any changes and close the options windows. Keep clicking "Ok" until all of the windows with this option are closed. Restart your computer if prompted. Your scrolling feature should be enabled.
http://askiris.toshiba.com/ToshibaSupportSite/search.do?cmd=displayKC&docType=kc&externalId=http--cdgenp01csdtoshibacom-content-support-manuaserguides-su1083054-SatM50M55PMAD0004401105May05pdf&sliceId=pdfPage_171&dialogID=79031610&stateId=0%200%20

you might have to reset it
Most modern laptops with touchpads offer vertical scrolling, horizontal scrolling or both. These features are located along the right-hand and bottom edges of the touchpad, respectively, and are activated when you swipe your finger along the touchpad edge. Scrolling functionality is nearly always enabled by default, but some users find the feature an annoyance and elect to turn it off. In most cases you can simply turn the feature back on using the Windows Control Panel.

Click the Windows Start button, select "Settings," and then click "Control Panel." Double-click the icon labeled "Mouse." Select the Touchpad properties tab. The labeling of this tab varies, depending on your computer manufacturer, operating system version and the device drivers installed on your machine. Common labels include "Touch Pad," "Device Settings" and "Dell Touchpad." If you do not see this option, you may not be able to turn on scrolling for your laptop; skip the remaining steps and refer to the "Warnings" section below. Click the "Settings" button within the Touchpad Properties menu and look for the section labeled "Scrolling Settings" or similar. Enable scrolling within this section and define other scroll settings, such as scroll zone width and scrolling speed. Click "OK" to confirm your changes, and then close the Control Panel windows opened in the previous steps. The scrollbar on your laptop is now enabled.
Scroll Is Not Working With Windows 7 b> Certain computer touchpads have a vertical section on the pad itself that is used to scroll through the page or program window that you are currently viewing on your computer. If the scroll functionality suddenly stops working but the actual touchpad is still fine, this means that the part of the software for the device that controls the ability to use the scroll has been disabled. You can enable it again in the Control Panel.
Click "Start." Click "Control Panel." Click "Mouse." Select the "Enable Scroll" option (or whatever similarly named option is available on your specific model of laptop computer). Click "Apply." The scroll bar on your touchpad will now work again.

b>

Most modern laptops with touchpads offer vertical scrolling, horizontal scrolling or both. These features are located along the right-hand and bottom edges of the touchpad, respectively, and are activated when you swipe your finger along the touchpad edge. Scrolling functionality is nearly always enabled by default, but some users find the feature an annoyance and elect to turn it off. In most cases you can simply turn the feature back on using the Windows Control Panel.

Click the Windows Start button, select "Settings," and then click "Control Panel." Double-click the icon labeled "Mouse." Select the Touchpad properties tab. The labeling of this tab varies, depending on your computer manufacturer, operating system version and the device drivers installed on your machine. Common labels include "Touch Pad," "Device Settings" and "Dell Touchpad." If you do not see this option, you may not be able to turn on scrolling for your laptop; skip the remaining steps and refer to the "Warnings" section below. Click the "Settings" button within the Touchpad Properties menu and look for the section labeled "Scrolling Settings" or similar. Enable scrolling within this section and define other scroll settings, such as scroll zone width and scrolling speed. Click "OK" to confirm your changes, and then close the Control Panel windows opened in the previous steps. The scrollbar on your laptop is now enabled.
Scroll Is Not Working With Windows 7 b> Certain computer touchpads have a vertical section on the pad itself that is used to scroll through the page or program window that you are currently viewing on your computer. If the scroll functionality suddenly stops working but the actual touchpad is still fine, this means that the part of the software for the device that controls the ability to use the scroll has been disabled. You can enable it again in the Control Panel.
Click "Start." Click "Control Panel." Click "Mouse." Select the "Enable Scroll" option (or whatever similarly named option is available on your specific model of laptop computer). Click "Apply." The scroll bar on your touchpad will now work again.

b>

Most modern laptops with touchpads offer vertical scrolling, horizontal scrolling or both. These features are located along the right-hand and bottom edges of the touchpad, respectively, and are activated when you swipe your finger along the touchpad edge. Scrolling functionality is nearly always enabled by default, but some users find the feature an annoyance and elect to turn it off. In most cases you can simply turn the feature back on using the Windows Control Panel.

Click the Windows Start button, select "Settings," and then click "Control Panel." Double-click the icon labeled "Mouse." Select the Touchpad properties tab. The labeling of this tab varies, depending on your computer manufacturer, operating system version and the device drivers installed on your machine. Common labels include "Touch Pad," "Device Settings" and "Dell Touchpad." If you do not see this option, you may not be able to turn on scrolling for your laptop; skip the remaining steps and refer to the "Warnings" section below. Click the "Settings" button within the Touchpad Properties menu and look for the section labeled "Scrolling Settings" or similar. Enable scrolling within this section and define other scroll settings, such as scroll zone width and scrolling speed. Click "OK" to confirm your changes, and then close the Control Panel windows opened in the previous steps. The scrollbar on your laptop is now enabled.
Scroll Is Not Working With Windows 7 b> Certain computer touchpads have a vertical section on the pad itself that is used to scroll through the page or program window that you are currently viewing on your computer. If the scroll functionality suddenly stops working but the actual touchpad is still fine, this means that the part of the software for the device that controls the ability to use the scroll has been disabled. You can enable it again in the Control Panel.
Click "Start." Click "Control Panel." Click "Mouse." Select the "Enable Scroll" option (or whatever similarly named option is available on your specific model of laptop computer). Click "Apply." The scroll bar on your touchpad will now work again.

it depends what brand product you are using. for most touchpads you just drag two fingers next to eachother on the touchpad and it will scroll up and down. for some others you just drag one finger along the edge of the touchpad

To move the pointer, slide your finger across the TouchPad surface in the direction you want the pointer to go. Use the TouchPad buttons like the corresponding buttons on an external mouse. To scroll up and down using the TouchPad vertical scroll zone (right edge of the touchpad), slide your finger up or down over the lines.

NOTE: If you are using the TouchPad to move the pointer, you must lift your finger off the TouchPad
before moving it to the scroll zone.

you probably just need to clean touchpad
and check settings in control panel
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thanx