Firefox "installs" in two places; the Program and the Profile. The Program is probably in c:\programs. All the customized settings are in the Profile, and that's where the extensions are as well. You are using XP, so the profile is located:
%AppData%\Mozilla\Firefox\Profiles\xxxxxxxx.default\
where xxxxxxxxx is some random string.
I'm sure that there's an extension that freaked out on you; that's generally the problem when things freeze up. So, kill your profile. Go to the directory I just explained above, and move it to C:\temp or someplace safe like that. If it starts fine after that, I'll let you know what files are 'safe' to move from the old profile to the new one.
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I can't read your signature. Sorry.
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