Upgrading from XP Home to Pro
My girlfriend just bought a new laptop, and naturally it comes with Windows XP Home, with SP2. Yay. Now, naturally I want to put XP Pro on it instead, and I was wondering if anyone knows if you can use a standard XP Pro disc to do a full upgrade? My girlfriend wouldn't take too kindly to me scrubbing the hard drive and loading Pro from scratch (although that's what I really want to do) but she would be okay with me doing an upgrade. Only thing that may be an issue is the computer has Home edition with SP2, my Pro discs are either with no SP or SP1.
So, can I do it? Or is formatting the only option?