Is it a laptop and are you using a mouse? That could affect the answer, but in general, you may have to update the driver for the mouse and keyboard.
Right click "My Computer/ Properties". Select HARDWARE TAB and click DEVICE MANAGER... New the Device Manager Windows will come up.
In Windows Vista, right click on My Computer, choose Manage, then choose Device Manager and click on the Mice and/or Keyboard list. Right click and choose Update Drivers or you can do the same under Properties
Look for the keyboard and Mouse. Click on the keyboard (+ box) to expand. That is what you have to uninstall... Right click the drivers and select UNINSTALL. Do the same with the mouse and restart the computer manually because you won't be able to use that mouse until the next reboot probably. Now, instead of rebooting your computer you, turn it off. Turn on your computer and let it automatically search for updated drivers
at 2:27 AM on Oct. 11, 2011