.. for this particular.
Quote Originally Posted by Greyfox
… In particular if there is any Mozilla folders in C:\Documents and Settings\username\Application Data\ then delete them.
Possibly a further 'small point' caveat for those who may also have SeaMonkey in addition .. do not delete the %appdata% Mozilla directory as it contains both Firefox and SeaMonkey profiles (the SeaMonkey branch is identified by the *.slt dir in the path, the FF one is a subdir from Mozilla named Firefox of all things ).

If you delete your profile, be prepared to re-do all your personal settings, passwords, bookmarks and addons that were installed to the profile location (the usual method since the profile is generally left alone when FF is uninstalled from the app dir .. people have been known to become irate when they need to re-do the whole deal or they did not back up all that info).

On a side note, I found a nice page relating to Mozilla and Netscape(old) as well as SeaMonkey's profile location and details of the files therein here at Holger Metzger's pages. The Firefox and Thunderbird info may not be terribly recent (my FF profile dirs have had a .default 'suffix' for awhile, now .. if any - portable app style FFs are another case entirely). The world is a wide and varied place