Well i usually don't trust windows standardsettings
but you are probably right because i never heard about mpg files containing virus or whatsoever
The scan found the infected file in the recycled
the path was c:\recycled\dc51.mpg
I found this file after rebooting under win98 because i could not run the scan under win2k
My mistake was to delete it when the scan prompt me what to do with it
As i said before, i'm not sure about what exactely happenned
but i can tell you one thing : this virus is a mess
anyway, thanks for the link, it helped me a lot to understand, i whish i had it before because there is no description of it in avast virus database