I use Avast Too, its great, i had Norton and that seemed to do nothing exept tell me its just let a trojan horse through, whereas Avast tells me its caught one and it says something like "theres no need to worry" which seems to work like "Don't Panic" from hitchhikers Guide for me, i have neaver found a good free anti spyware i usedto but they now all seen to tell you that theres so many on your computer but wont do anything about it for less than £30.