PS: This virus is a cussed one, because it bounces around infecting file in different locations.
So far, it does not seem to have caused any damage, but after installing Malwarebytes AntiMalware, I found no fewer than eight bad registry keys, and one bad file doing a Quick Scan. The program let me delete the bad keys ided as Minibug Transporter, with the Adware being Adware.Minibug.
After restarting, and doing an Avast scan, it found a number of corrupted files, mostly in System Restore, which were deleted. A couple of other executable files, were also detected, and I deleted all of them.
Another Malwarebytes AntiMalware scan found nothing.
I don't have a clue how this virus/adware was picked up, as I am very conservative in the use of computer.
Notable were security updates of Opera and OpenOffice. Nothing wrong was found there. And, my wife spent some time in Facebook, mostly making comments. We, never, got any warning, until a computer scan scan was done. Since the System Restore seems to have been jeopardized, I have not tried any System Restore.
I will report if there is any other development.
It should be obvious to Richard that it is not the protection which I have, but something very sneaky.
It is curious, though, that the only reports I found for Win32:Malware.gen are from Avast users?
UserAgent: Mozilla/5.0 (Windows NT 5.1; rv:2.0b10) Gecko/20100101 Firefox/4.0b10