should let you do that plus if you look in the compiler folder you'll find your keys, copy them to a usb, and then paste them back when you re done the drive all will work again, or just install it all and re register the key, you should have the keys in an email tyou had when you did it the first time.
I've re intalled about ten+ times now with out much bother, however somethings will be missed and you'll end looking fioor the answer which will on here as they all been done.
don't for get to do the update on physx and AI and the install directx 9.0c graphic drivers.
see your next post in about 5 hours if it goes to plan.
Dark Physics makes any hot drink go cold.