which is the best antispyware?

I think Avast is the best anti spyware virus in the world.You can just install it in your PC and sit.Let them do the work.If you want you can download it for free,with the trial time for 30 days.It will set an automatic update,so you will not have to worry for the newest virus.I have been using it for 1 week and very satisfied.Recently i found a website where I can download the serial code.So I think its practicly the best and free anti spyware.