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Reinstall the touchpad driver from sony support page of your computer model.
If the touchpad works intermittently, erratically, or without touching it, the problem may be caused by a recently installed piece of software.Troubleshoot the computer to see if the software is causing the problem.
If model-specific information is required to complete any of the steps in this solution, refer to the operating instructions supplied with the computer. Manuals are available online through the Manuals/Specs/Warranty link on this page.
This problem may be caused by an installed printer that is not physically attached and turned on. Attach and turn on the printer and then start the notebook. If this solves the issue, contact the manufacturer of your printer for additional troubleshooting information.
Touchpad driver updates are available through the Drivers & Software link on this page.
Because each of these steps represents a possible solution to this problem, check the touchpad status after completing each step.
Make sure that an external USB mouse is not connected to the notebook.
Verify the correct AC adapter is being used and connected properly.
If the problem is that the pointer is moving around the screen erratically, make sure the touchpad is not accidentally being touched while using the keyboard.
NOTE: Try covering the touchpad with a piece of cardboard or paper while typing on the keyboard to see if in fact the touchpad is being touched while typing .
Turn off and then restart the computer and, as the computer is restarting, press the F10 key to launch the VAIO Recovery application. If the touchpad does not work properly while in the VAIO Recovery application, then the issue is hardware based and service will be required to resolve the issue. If the touchpad works properly, proceed with the rest of this procedure.
NOTE: Unless you wish to do so, or as a last resort to resolve this issue, it will not be necessary to proceed with any of the recovery procedures.
sure that you are not placing the hand on the touchpad while typing....
This might be due to the drivers issue with the touchpad.. Try to
unistall the drivers of touchpad from the device manager.. Then install a
fresh copy from the dell website(www.support.acer.com).. If the issue is yet to be fixed please contact Acer to replace the touchpad....
1. While you're typing, your hand or thumb might be hitting the mouse area near the keyboard which causes the mouse to move around.
2. You could have some heavy resource program running in the background which slows the system down.
3. You have an infrared mouse without a proper mouse pad so the infrared causes the light to bounce around causing issues.
4. A virus :(
I frequently have the same thing when using a Dell laptop. The problem MAY be with the touch pad. Without noticing it, my thumb touches the pad and away goes the cursor!
So try this: Open the control panel and go to mouse. Look at the top for Touchpad. There is a setting in there for sensitivity. Reduce the setting so that you need to apply more pressure on the touch pad to move the cursor. Test it a few times to make sure it is still functional before closing the control panel. Then try typing something in a word processor and see if it is any better.
Your laptop should have software pre-installed for your touchpad. This should probably be in the Control Panel. Once you find the software there should be options to change the sensitivity. Hope I helped.
Go to my computer, right click>properties>hardware tab>device manager, then look down the list for mice and pointing devices, click the '+' sign and right click on your touchpad and select uninstall, do the same on the keyboard line and then restart the pc.
Both touchpad and keyboard will be reinstalled and then ready to use again as it should be back to normal