Removal procedure is easy. You only need to delete partition with linux, and then, boot from windows xp CD then recovery console, then type fixmbr, to restore the original master boot record.
Those are the "relative" software:
Photoshop - The Gimp
MS Office - Open Office 2.0
Acrobat - Acrobat (there are a lot of readers)
QuarkXPress - Alyssa (if my memory still workin')
For gaming...
There are some game that are native for linux and windows like America's Army, Doom 3, Quake.
Other games, some can run under "Wine", other can run under "Cedega", a lot of others... dont run