Formerly (2008) it was + Kaspersky Avast ... (it was public knowledge)
But now the "antivirus marriage" became "State Secret"!
This explains its exceptional duplicate detection. But also the "heaviness" on the system.
Estimate 15 seconds more to start the PC ... and when the computer "train" it really does not improve things!
That's why I finally preferred to him "Avira" and now Antivirus Microsoft (essential) which - after all - is not so bad
and especially ... incredibly light. (And does not appear in the Pub every update! Sacred Avira ...)
These 2 (Avira for those who are allergic to Microsoft) are free. While G-DATA (even for 2 positions) is quite Expensive.