My Window Vista Theme Keeps Reverting Back To Window Classic Theme After A Restart Help Please I Had This Problem For A While Now And I Am Getting Physically Sick Of Changing Back To The Original Theme Then Having To Switch It Off N It Would?

Of been third party applications may be disallowing the change(s) from "sticking" so i got rid of McAfee and spy bot temporary just to taste it out but nothing happen. System restore is out of the picture too because its been awhile I've been couping with this now and didn't really think it was a big deal until now. I have the window vista home premium please can anyone help i will be so grateful.