|If you were upgraded to Windows 7, sounds like a driver issue. You need to look for a current mouse driver for that OS.|
Here's a suggestion - AVOID wireless mice & keyboards. I simply cannot understand why anyone would use these. I mean, wireless mouse or keyboard does what for you...., besides costing you $ with batteries & giving you headaches? You have to sit close to the monitor to see whats on the screen, so, it's not like you can take your wireless mouse & KB in the next room and work on your PC.
WIRED mice & KB's - plug 'em in - snap - always works - all (majority) the time - no batteries - no resetting the bluetooth wireless connections - I just don't get why these bluetooth input devices are even used.
Just another stupid saying...