You're right - we do have XP Pro running. However, we have been having increasing problems with getting things to run properly (or even at all). It came to a head about a month ago, when we lost our connection to the net. We worked with the tech people at Sympatico but, in the end, they could do nothing (it wasn't a sympatico problem) and suggested we reformat the hard drive & start again. This was the latest problem with sympatico, so my husband decided to switch to Rogers. Again, it did not work. The modem was connecting to Rogers, but our computer was not communicating with their modem. Again, I spent countless hours on the phone with their techs - going through everything they could think of - and it came down to the suggestion that we reformat the hard drive & start again from scratch. I must mention that we have a teenaged son who regularly downloads programs and uninstalls/removes them again. In the past, I have been able to fix those problems by uninstalling the AV & firewall, reparing XP from the CD, reinstalling Norton AV & firewall. It did not work this time (and we tried several times).
To prepare for reformatting the c: drive, my husband went through everything and moved what we wanted to keep to the d: drive. And that is where we stand now. Hopefully, we can get this done by the end of the weekend ...