Installing older ATI catalyst drivers

[Blaaaaaaaah]

Soo I went and updated the driver to 11.8 when it prompted me to do so andddd now I'm regretting it (yess I know I shouldn't have done it if you're about to nag me about it)

Anyway how do you exactly install older versions? I tried to install it last night but it didn't go back to the older version. I can't find anything on google... should I follow guides to completely uninstall the driver, and then reinstall an older version? I'm just hesitant about uninstalling the driver completely because I dunno what that'll do.. like.. can I stilll see my screen to install the new one.. LOL

ALso I find stuff about needing to clear registries but I don't exactly know how to use CC cleaner and wasn't sure how I can find/remove ATI registries only @_@