Ssenkahdavic on 27 March 2010
This guide will show you how to do it (Dual Boot) with Windows XP installed first.
Once you have dual boot set up, you can always just move your data files to the W7 partition, delete the XP partition and remerge the partition.
Btw, I end up getting between 4-9FPS difference in XP favor over W7 (unless you go over 4gb of RAM since XP64 is terribad)
