Request aid: strange PC behaviour

[Slug For A Butt]

Bijo, I think you are missing the pount man. Just try that old 2 button mouse and see if the haunting stops.
If the problem continues, don't buy a new mouse because that's not your problem. If it works OK, THEN buy a new mouse. Don'y buy new shit that you don't have to, hoping that it works. If you have a ratty old mouse, it will do to test if it IS your mouse that's the problem.

EDIT: you have tried a reformat and reinstall too haven't you?