The firefox program related files are stored in the program path, and obviously easy to reinstall. The firefox settings bookmarks passwords etc re stored in a different location and path as the profile

Are you reinstalling XP or an updated OS, and do you have multiple OS accounts ? Reinstalling firefox may be the easy part, but off topiv for this forum: you could potentially have problems with other stored information, note XP is not going to allow you to recreate accounts just by using the same names, they will be new different accounts, although that is no problem to firefox, it may be a problem with for instance encrypted files and folders accessible from only named accounts.

See also http://kb.mozillazine.org/Transferring_data_to_a_new_profile_-_Firefox

There is also sync, new and sometimes temperamental, previously recommended as a backup tool, but we now say it is not to be used for that, but it would do no harm to sync if you have other devices, it may help you.

Hey John99, I didn't want to wait for a reply, figuring that it would take days. Thanks for your reply though, I just used my E:\ drive as the receiving device, did my install on C:\, and then got my info back using sync. Your help is appreciated.

Glad it worked out.