For the past month, I've been trying to fix an annoying problem on my XP computer of windows in any program that I'm running repeatedly losing focus. It can occur very frequently and lasts for from 1 to 5 seconds. At these times, my tray icons show me that the computer is trying to communicate with the Internet. Sometimes it doesn't happen for hours or even days at a time. I have also seen an occasional phony looking message offering to get rid of "possible" viruses by downloading something or other - which I never do. At one point I was getting short bursts of rap music from my speakers but that has stopped.
Evidently there is some sort of virus doing these things and I can't get rid of it - or them. I run my updated Trend Micro anti-virus regularly and have used AVG, SpyBot, and Avast to no avail. Looking at Windows Task Manager, I see a lot of I/O writes at these times from LSASS.EXE and VPROSVC.EXE, for whatever that's worth. A Microsoft techie has given me various suggestions but none have fixed the loss of focus problem (although his suggestions have sometimes caused me other problems). We are still working on it and getting nowhere.
Has anyone experienced this and does anyone have any suggestions about fixing it?