Sounds like a conflict.
Try going into the System Configuration Utility (run--> msconfig--> startup tab) and getting rid of everything except your antivirus and your firewall, and anything you have to have (like broadband drivers and such). Click Apply, then restart.
You may also want to check the sensitivity settings for your mouse. Does it cry easily? LOL. Really, go Control Panel--> Mouse. Click through the tabs and look at your settings. Set them to what you need.
My Rig: SABLE
Antec 300 Illusion / Antec EarthWatts EA650 650W / EVGA GTX 760 2GB
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Win7 Ult 64-bit - Func MS3 Mouse - CM Storm QuickFire Rapid Mech Keyboard
R.I.P. Danny L. Trotter
... 14 Nov 1945 - 4 Sept 2009