I alway use THE trinity:
Ad-Aware SE Personal
Spybot S&D
Microsoft Antispyware
(you can complement this with trend online spyware scanner)
-FREE
OR
Trend Internet Security
-NOT free, but really good all-in-one suite
I came here by reading another forum. Don't remember exactly which one.
You can learn a lot from these forums,
I always read most of the time.
...my first post was closed (it was useless as a matter of fact)