Ok get these progs (or some like it)
System Mechanic
AVG
AdAware
Registry First Aid
Then run
Housecall
Then set your homepage back again
Then Defrag
Then Restart.
btw, if ur not using winxp, keep your fingers crossed the whole time (no system restore)
Also, if all else fails, just search google and see what other people are saying. All you have to do is type in the web page that keeps displaying on yer cpu. Might be a few files I missed.