Re: need help
You can easily remove Windows XP and install Linux over it just with any Linux install CD. But if you want Windows XP again in the future, you are going to need a Windows XP cd or a "restore" CD that came with the PC.
PC: AMD Phenom 9950 2.6ghz Quad Core, ATI Radeon HD 5770, 8gb DDR2 RAM
Phone: Apple iPhone 5s 64gb (jailbroken)
Handheld Games: Nintendo 3DS XL, Tapwave Zodiac 2, GamePark Holdings GP2X F100