First of all I have no idea why would you want to go back to vanila but thats really none of my business. Here go to this link
http://download.cnet.com/3001-2086_4...c5c3176b1a6998 give it a second and it will automaticly start a download. This program is called CCleaner. Its a very good program for cleaning your PC from unwanted and old files. Download and install its very self explanitory. If you need help just PM me and I ll go over it step by step, its not a problem.
Sh@t nevermind I see you already have it. Use the CCleaner to remove the files. Go into tools and then uninstall all thats left from RTW. Then go to cleaner and tick all the boxes to clean all the files, do the same with regestry. Also you can manualy go into C/Windows/Prefetch and delete RTW prints.