Virtua PC, on my work PC i have Virtual PC, Orig OS is XP, then i have virtual PC with 2 more os's 98 for some programs and Win 3.1 on the other part of the computer..... works great, govt jobs like mine use it alot. And when i get a hold of a mac, ill have virtual PC on it for my few applications i use only in windows.
Runs about $90 if u have your own CD Key and ver of Windows or another OS...or $229 with winXP included.