Agree with "Death"! Just deinstall the game and reload and add the patch. Be sure and save your saved games. You might also want to copy the Saved Games folder into another directory for a back-up. Do not know why you would want to reinstall the "OS". Last thing I would do, especially if the rest of the programs and the system are just fine.
Bill.... <img src="/ubbthreads/images/graemlins/up.gif" alt="" />
Yeah, Johnny's right; better backup the saves anyway, in case if you blindly say "yes" to "erase savegames?" message. At least I do backup them <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />.
BTW, without using the NO-CD patch, I had to reinstall the game 4 times when I played it the first time <img src="/ubbthreads/images/graemlins/eek.gif" alt="" />!
I alwasy forgot that I should never save when my minimap is on...