Have you installed any Stardock products like ObjectDesktop...if so there's an app running at startup called Trayserver.exe and it's hi-jackin' yo' systray. Disable that and you should be all set. If thats not the problem please reply. :)
btw...read through the forums this problem and many others already have posts with fixes...you can save your self a bunch of time and anguish just by doing a little reading. :)
/Edit...damn you DeViLbOi...you beat me again. /reminds self to type faster and use less verbage. :)