To turn on Scroll lock you will need to press and hold the FUNCTION Key (FN), this is located beteween the Left CTRL key and the Windows key.
With FN Held you then need to press the F12 key on the keyboard, this will enable scroll lock.
just repeat the process to turn it off
quick keys:
FN + F11 = Num Lock
FN + F12 = Scroll Lock
SOURCE: I use toshiba satellite A305-S6872 laptop would not load OS
you will most likely have to go into the recovery console to fix the problem or even re-install.
The other two solutions are to either boot up in safe mode to correct the problem by trying to revert back to a saved well working time, or take out pci cards and reboot always taking out another pci card until you find the problem.
if nothing works, re-install or fix in recovery console. <<< or >>>
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at re-install, choose repair windows.
in the (right, pane) select to open the Control Panel: next open the [Hardware and Sound] category, 
click on the "Mouse" applet. Next, in the Mouse Properties" (window) click on the "Device Setting" button, 
once the window open, click on the "Settings" button just below the "highlighted" (Name) of the device: Synaptics TouchPad. 
Try out some of the "items listed" Tapping, Virtual Scrolling... "You must click on the "Apply and OK buttons when finished. " Note: Restart the computer; this will make sure the changes are correctly applied, and working properly. "Rating the solution will let me know if the problem is fixed, or you will need further assistance, thanks for using FixYa, paul7of9" 10,635 views
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isn't the Scroll Lock key on the Function row of keys, on the right hand end?
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