XP is pure, undiluted evil. It's sorta like that orange stuff they put on Cheez Puffs in binary. It will devour half your hard disk, drain your memory, refuse to open any of your software, and if it makes your computer start speaking in tongues and levitating it'd be no surprise to me. Plus, it's almost indistinguishable from Mac OS X, which means that it's the computer equivalent of dressing up in a frilly pink feather boa and midriff shirt and going out staring at guys crotches and lisping.
Trust me, if you want the XP experience, save yourself some trouble and install Satan directly onto your primary driver. It's a lighter download and you don't have to register it. Also, he's now offering great deals for your soul.