Edited with new info:
Me wonders if the next info has something to do with my bug ?
quote from this post on the "sevenforums.com"
XP Mode is not designed with gaming in mind and will work with only the most basic games (ie: Solitaire). If you want to use a game, either dual-boot or use VMware Player (http://www.vmware.com/player
), which has the option for 3D Acceleration.