How do I undo Ultimate Fix??

I bought Sims 3 (and showtime) through steam. Me and a friend tried applying the ultimate fix because nothing was working (I did follow the instructions listed on this site. They were not working, perhaps because I bought the sims through steam?)

Anyway, the Ultimate fix is now not letting me use the sims. I would reinstall it, but I can't do that without deleting all of my game data (says steam).  Is there any way I can undo the Ultimate fix or restore the game to what it was before? Any help is greatly appreciated!

Steam games are not compatible with disk games, so the Ultimate Fix will not work here...
Here's what you can try:
Open the Ultimate Fix, and use the folders that aren't named "#Crack". Copy/paste the files to the respective locations, then update your game through Steam.
Hope that fixes it.
If you want to install games from here, you'll have to uninstall your Steam games and install the copies from here instead....