avira free personal

This free antivirus has an excellent detection rate, and at the same time, is very light on resources, making it a favorite among many users around the world.

Apart from offering protection from virus, trojans, worms etc, it also offers antirootkit, antidialer, antiphising and antispyware protection.

The high detection rates mean there will be some false positives. The program also has a nag screen, which will pop-up every time the definitions get updated, but the excellent protection it offers, make up for these negative points.