dude, you can't install xp OVER xp like you could in win9x. All you'll be able to do is install a second copy, which will give you 2 operating systems on one hard drive, which is a no no. Just backup your stuff and load the toshiba disk so you don't even have to worry about drivers.

1999 Silver Frost SVT #609 of 2760 Quaife, lightened SVT Flywheel, SPEC stage II clutch, removed resonator, k&n drop in - various other goodies too.