I've given up on Antivir, their free Classic version, that is.
I was using it for some time, until this March 9, when on
downloading a file from the net, it detected trojans and
prompted me for action. In my haste, I accidentally
selected "Ignore" ! My system was badly infected and I
had to spend some two hours using multiple antivirus
(including Bitdefender 8 and AOL's Kapersky),
antispyware and registry backtracker programs to clean
up. Apparently one of them, "Adirka.exe", as described in
Prevx1's database link, is a particularly bad and very
recent infection, being first detected on March 5.
That is the main drawback of the free version - you can't
set the resident shield to "Automatic Delete", which
would have prevented the infection.
You can see my post in the Antivir forum here.
http://forum.antivir-pe.de/thread.php?threadid=19223
This must have been the infection which inserted in the
two trojan horses (Xorpix.m and Worm.Glowa.Ar) in my
post above, since a look at their "Properties" showed
a "Modified" date of March 9, and about the same time.
A manual scan with Antivir, despite its huge
database of 700,000 (probably the largest on the
market), failed to detect them. Kapersky detected
the first, Bitdefender 8 the second. Sending them to
Virus Buster confirmed the first infection.
I've since switched over to AOL's Kapersky Antivirus
Shield as my resident shield, despite its much smaller
280,000 database, with Bitdefender 8 (400,000
signatures) as a manual scanner.