This is really wired.
When I told avast!4 to move the infected file to the virus chest, Windows Explorer reported an error and closed all windows (and asked me to send an error report, which I did), exept the avast!4 one.
When I then tried to open a new Exlporer window, my system suddenly shut itself off (no regular shutdown, no bluescreen crash, just a click from the hard drive and then complete power off).
After reboot If I found the infected file in the virus chest. I scanned this file from within the virus chest and the scan was negative.
On another system with virtually the same configuration/setup avast! 4 did not report any problems.
If I copy the file from the other machine to the machine where I got the virus warning and then scan the copied machine, everything is negative: no warnings.
So everything appears to be fine now, but what happened in the first place?
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drahnier