it's probably a registry issue...
One think I can't think of is the tray notify, U can try:
Start> run ; type regedit and ok.
(sorry for so many keys, but it depends on your Windows version actually)
And if you still can't find the IconStreams and PastIconStream then you can also use Edit >Find next to search for them.
When U find IconStreams and PastIconStream, you right-click on both of those and delete them.
Do not do anything else in there!
Restart. Did that helped? I can't think of anything else right now...