AVG Free from Grisoft - no need to look anywhere else really for AV protection. Free to download - Free updates - only difference between it and the PAY for AV is the restriction on some of it's scheduling tasks.
I use NOD32 from Eset. Not free, but well worth the small expense.
It holds more Virus Bulletin 100% Awards than any other anti-virus product available, consistently detecting all known viruses "in the wild" without false positives.
Microsoft AntiSpyware Downloaded from thier Web site.
Its Free and easy to download (on Broadband).
Read in a Computer Magazine that it was rated better than some of the one which you can buy in the shops
Regards
Frosty
Spyware and malware are a bit of a problem especially for those who have broadband and an always on connection. Microsoft Anti-Spyware seems to be fairly good at removing that so continue to use it.