Recommended virus scan software

i have just gotten a new laptop but i need some kind of virus scan software for free.

can anyone recommend any freeware virus scanners that are any good?

yeah, 3 is right. I tried a crack and BAM! Spyware infection, trojans, viruses. It sucked. I'm just now getting my laptop back to how I liked it. However, if you must:
http://www.nsaneproductions.com/?page=apps/security