It's very possible, fishin. The virtual memory message started appearing (occassionally, then more often, then every day) after I updated McAffee SecurityCenter. I don't know if it's just a coincidence, but from the moment after that thing updated, my computer was much much slower...
I tried the System Restore to get rid of the updates, but to no avail. The updated version stayed updated.
Also, each time I run virus scan and adware scan, it finds normally 6-10 files of something. So there is also a possibility of having a virus or spyware lodged somewhere.
But I also do get pop up messages at the Shutdown - usually two or three...about this or that program running and needing to be ended manually.
Or maybe it's ALL of those!