Review: Win4Lin Pro Desktop 3.5
"For several years, Win4Lin has offered a virtual operating environment whereby you can run Microsoft Windows inside of GNU/Linux. The first several generations of Win4Lin were limited to Windows 98, difficult to install, and had requirements that were difficult to satisfy, such as a proprietary kernel module and various acts of command line kung fu. Version 3.5 still has some of these problems, but it's nowhere near as bad as it used to be."