Try renaming the following folder:
C:\Documents and Settings\[username]\Application Data\Mozilla
Name it something like Mozilla_backup. (Be sure to close Firefox and any other Mozilla product (like Thunderbird) that you may have open.) Then launch Firefox again. See if that helps.
My thinking is that there's a corrupt file in there that wasn't cleared out when you uninstalled/reinstalled. Firefox will recreate all the files in the Mozilla folder if it doesn't find one.
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