Thanks for all your help guys, much appreciated thank-you.
I tried 'Housecall' in the end (I'm sure you know what this is) and it seems to have done the trick, however it has disappeared/reappeared before so I'm not counting my chickens.
It found 12 problems, one of which was 'gtpbx.dll' in System32 which is linked with virusburst. Housecall was unable to delete it, and neither was I as it was in use/write protected. So I moved it to the desktop next to my recycle bin, restarted, then as windows started I quickly moved it to my recycle bin before it had a chance to load (if anyone knows a better way to remove these things let me know).
RAZORBACX - The cause of the problem was a video codec installer, I can't remember exactly the file name or where I got it from (sorry), I was trying to watch a stream and it said I needed it. Well done for wanting to know to help others, top man!
MIKE - Thanks for the links, helped me with the DLL files I needed to remove, very useful thanks.
DMB2000uk - I also downloaded Spybot aswell, and it found some other things so thanks for that, but ad-aware was a free scan only (pah!).
MUM - Thanks for having me, love you xxx.
DAD - Where are you?