Warning: Spyware threat has been detected on your PC
Your computer has several fatal errors due to spyware activity
It is strongly recommended ...etc.
CLICK HERE TO SCAN YOUR COMPUTER
If I click, I am taken to a site where they want to sell me PC-Antispyware or PC-CLeaner, which, for all I know are legitimate products (except for the protection racket marketing style).
I have run SUPERAntispyware, AdAware, Spybot and Microsoft's onecare.live.com, some multiple times, and I always find more malicious or suspicious "issues." SUPERAntispyware and Spybot programs have either been able to delete or quarantine the suspicious code; AdAware and onecare.live have found but not always been able to eliminate problems.
What should I do next.