Just to be sure, I would use a free online scanner to 'hedge your bets'. A few are listed here:http://www.bleepingcomputer.com/forums/topic3616.html
Is there anything in device manager showing conflicts with the mouse or other pointing device?
To get there, click Start
and type devmgmt.msc
in the textbox. Hit the enter
key.Network related super-long-shots:
Do you have anything like PCAnywhere or VNCViewer installed, with your PC acting as the 'server'?
(Assuming you have XP) Are you allowing remote connection? Right-click on the My Computer
and select Properties
. Select the Remote
tab. If Allow users to connect remotely to the computer
is checked, uncheck it and see how the mouse behaves.