We want to sample win XP on this box without wiping out the current software installation.
So, Windows 98 running a VPC of WinXP.
Is there something other than MS's version out there that might do this?
Don't think so. Bear in mind also that a VPC solution isn't going to tell you anything about how XP would work on that hardware, as it is only exposed to an emulated subset of hardware that doesn't differ between machines.