asian XL: I followed this tutorial. Dual boot worked flawlessly. Unfortunately, I didn't want to spend too much time re-learning how to use another OS, so I deleted the partition. Deleting Windows 7 also caused no problems in booting up Vista, my current OS. XP is also mentioned in the tutorial on how to uninstall.
http://www.techspot.com/guides/143-dual-boot-windows7/
My C:\ had 200GB free space so I partitioned (shrink Volume), which resulted in no data loss at all. Hope it all goes well.