Whats the best FREE anti Virus program ?

[DPyro]

Take a look at reviews, Clamwin sucks. Avast has won many awards.

[jamotto]

I did, it does what I need and not more.

[quzar]

Any good antivirus will 'take over your computer' as you say, because that is the best way to minimize the damage a virus can do and detect them as fast as possible. Otherwise you have to rely on something like timed scans.

AFAIK AVG is still the top rated free AV, and they have always had a pay version, there just used to be less of a difference.