Dont reinstall, it is probably the driver
for your keyboard or monitor KME Multimedia Keyboard ( KE9801 ) Driver Download
If you were not having problems before the update. Use system restore to go back to good times. You will have the old driver and everything will be like it was then System Restore - How to
You say that you dont have a restore point or it does not work again, then roll back
Go to search
in device manager start with keyboard
if that is the driver, you can roll back from there.
If you updated from device manager, before, or you got the driver from an update. Get th next one from the website.