After that hacker scare I've decided to post this list of security programs that I've collected and keep updated. These programs are all free and do not have conflicts with web programs and p2p software.

Anti Virus:
AVG
Avast!

Firewall:
Kerio Personal Firewall

Anti Spyware:
Spyware Blaster
Spybot SD
Adaware SE
Windows Defender aka MS Antispyware aka Giant Antispyware.

Windows OS Cleaner:
CCleaner

These are good programs. I've been using them lately a lot. But one thing you should always remember is, that if you don't scan regularly it doesn't really matter what you installed. So scan 'till the last bug is squashed!