before you reinstall - make sure you do not have any apps that start automatically at start up..
go to your system prefs and then accounts and then select your user and select your login items and delete what is there.
quit all apps and then reboot and have a try..
if it is fine with other uses means its your user that is messed up, not OS
Apple MacBook Pro 13" 2.9GHZ i7 12GBs
Apple Thunderbolt display 27", Macally Bluetooth Keyboard
Internal 1 x OCZ Deneva2 SSD 480 GBs ( removed superdrive - installed 750GB HD in place )
LaCie Stark 1TB for time machine, Apple Track Pad
Moshi Keyboard cover ( to catch the drool when surfing rumor sites )