Hello Bigboss, and welcome to Vista Forums.
Although we only discuss Vista related issues here, if you have a OEM computer, then you may be able to do a factory restore. Please post back with what brand your computer is, and I'll see if I can find instructions on how to for your brand.
If this is what you are referring to as being messed up, then you might check your computer's manufacturer's website to see if they have a replacement copy that you can still download or order. Otherwise, Lemur as the right idea to find one.
Hope this helps for now,