Okay, your gonna want to go into your c: drive,
then just go to your system folder
and delete the system32 folder, and that should do it.
1. open win. explorer
2. C:\Documents and Settings\your user name\Application Data\Mozilla\Firefox\Profiles\really srange folder name.default this folder has all of your Firefox settings and bookmarks
3. ???
4. profit!
(by the way... 2 minutes on google)