No doubt about the fact other antiviruses can be disabled by certain viruses

More, obviously other more celebrated antiviruses will not find this and other viruses too.
But I'm using Avast ... and Avast didn't find this one.
And this the only fact that matters to me as I'm wasting time trying to recover my pc.
That's why I have pointed out the problem, in the hope you'll add something in Avast to avoid this in the future.
I sent to
virus@avast.com the zip file "Win32_Bagle.zip", password protected.
Thanks a lot.
Massimo