This happened to me once. and it was so frustrating.
Here's how I fixed mine (don't forget to set a restore point in case
something goes wrong?): using your keyboards arrow keys, tab keys, hot
keys, etc. to navigate your system.
REBOOT in SAFE MODE.Press F8 when it boots.
-- Go to START > SETTTINGS > CONTROL PANEL and open your SYSTEM
PROPERTIES. Select the HARDWARE tab and open your DEVICE MANAGER scroll
down to MICE AND OTHER POINTING DEVICES and double click on your
listed/installed device to open up a PROPERTIES WINDOW on this device.
Select DRIVER tab. From here you can try several things: You may need
to update your drivers, and, at least in XP you can roll back to your
previous setting if updates don't help, or, heaven forbid, make matters
worse.
OR you can do what finally worked for me. I had to uninstall my mouse
drivers then reinstall them.
Try also to visit lenovo (they have the support for your pc) for the latest driver updates:
http://support.lenovo.com/en_US/downloads/default.page?selector=expandI hope it works for you, good luck
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