Is there lower-cost or open source Antivirus software that's just as effective?

Compared to Norton.

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Is there lower-cost or open source Antivirus software that's just as effective?virus scanner

All of these are ones that I personally use and all are free.

AVG Removes I-Worm/Stration 路 BackDoor.Generic3.GBB and .GBC 路 Worm/Generic.FX 路 Exploit.WMF

http://free.grisoft.com/doc/5390/lng/us/...

Spybot - Search %26 Destroy detects and removes spyware, a relatively new kind of threat not yet covered by common anti-virus applications. Spyware silently tracks your surfing behaviour to create a marketing profile for you that is transmitted without your knowledge to the compilers and sold to advertising companies. If you see new toolbars in your Internet Explorer that you haven't intentionally installed, if your browser crashes inexplicably, or if your home page has been "hijacked" (or changed without your knowledge), your computer is most probably infected with spyware. Even if you don't see the symptoms, your computer may be infected, because more and more spyware is emerging. Spybot-S%26D is free, so there's no harm giving it a try to see if something has invaded your computer.

http://www.safer-networking.org/

http://superantispyware.com/

SUPERAntiSpyware is the most thorough scanner on the market. Our Multi-Dimensional Scanning and Process Interrogation Technology will detect spyware that other products miss! SUPERAntiSpyware will remove ALL the Spyware, NOT just the easy ones!