Avira Rootkit. I had trouble loading two other worm detectors or maybe they were just .exe files that ran by clicking on the file name without placing icons on the desktop or loading into programs. I remember clicking those two after downloading but nothing much seemed to happened. All were suggested by Moderator Marianna S. in this forum.
The trouble started with a virus or worm named "pservermouse.exe". It appeared on my computer's screen when I placed my flash drive in a USB port. This was just after I had returned from a client's office. I'd used their laptop to show them something from my flash drive.
I immediately scanned the flash drive with AVG but nothing showed up. Then I Googled the virus name and search returns showed it was a virus/worm mostly limited to Asia, where I am. Some of the fixes required loading other software and some said to change settings in XP and the registry. That made it seem like a trap.
So I posted here (message "Pservermouse.exe?" - 31 Jan) and Marianna suggested I use those programs. But even before I had downloaded and run them, the "Pservermouse" warning stopped appearing.
However, a week later at that same office, the client's IT guys say they got the Pservermouse warning from my flash drive. But my flash drive had been scanned by all those programs I mentioned and had not indicated any virus/worm presence on my flash drive or the entire desktop computer.
So I politely said I think the problem might be on their laptop. Interestingly, it was a common-used laptop - not assigned to any single user - and my computer seemed clean.
Each time I return home now from that office, I run a malware program (different one each time) to check my flash drive. But I'm still not sure because I never found and cleaned whatever caused the original warning(s) to appear.
That's why I was asking about having multiple AV (and malware) programs on the same computer. Thanks.