hey tony, might be quite radical, but just like stephenm52 said, i did the same. sometimes you can only erase everything by re-format the hard disk and reinstall windows and the other software you're using.
just make a back up, prepare half a day to spend with the computer and re do everything. i also discovered by doing this, i get rid of alot of unusuable things, trash that load my computer but i dont really need it! is funny how that happens!
good luck!
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Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.