then I would guess that your first thought is correct, that someone had installed WinAmp, etc.
Perhaps they uninstalled through the Add/Remove programs utility in the Control Panel and never bothered to do a sweep with a Registry Cleaner.
Very often files and registry entries will be left over after an uninstall, but XP handles them much better than Win 9x or ME ever did.
Not much to worry about I feel.
While perusing my registry as part of running RegSeeker, I came across references to a number of programs (pathfinder, phobus, WinAmp for example) which have never been installed on this computer - at least not since I bought it from Dell in December 04. Is this my clue that this really ISN'T a new computer - that someone had installed these programs at some point, uninstalled them, and never cleaned up the registry? Or am I just being paranoid?
Any insight would be greatly appreciated!