Firefox hangs when opening Tools - Options, even in Safe Mode

I've just upgraded to Firefox 3.6.13. Prior to upgrading I removed all add ons. I went to Tools -> Options to check the settings and Firefox hung. I had to end it with Ctrl-Alt-Del. This happened several times. Then I started Firefox in Safe Mode and attempted to view Tools -> Options again. Firefox hung. It does not try to submit any crash reports (apart from the automatic Microsoft report that occurs when you end a program manually).
I can browse websites ok, open PDFs, view Flash, etc. I just can't view my options!

Thanks for the note about profile locations.
I deleted mimeType.rdf in my existing profile, still have the same issue - can't view Tools -> Options for the Applications tab, or download a file. Same goes for a new profile - the same issues arise.
Firefox never does crash, I can leave it in this hung state for hours (I left it in a 'not responding' state last night and it was still hung this morning).
I was going to add a screen shot to this post but Firefox hung when I clicked on the 'Browse' button. Perhaps this is an issue when FF tries to interact with my directory structure? Does that get us any leads on what's wrong?
FYI, I currently have my antivirus disabled & not running in the task bar just in case that was interfering somehow.

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    Thanks for the note about profile locations.
    I deleted mimeType.rdf in my existing profile, still have the same issue - can't view Tools -> Options for the Applications tab, or download a file. Same goes for a new profile - the same issues arise.
    Firefox never does crash, I can leave it in this hung state for hours (I left it in a 'not responding' state last night and it was still hung this morning).
    I was going to add a screen shot to this post but Firefox hung when I clicked on the 'Browse' button. Perhaps this is an issue when FF tries to interact with my directory structure? Does that get us any leads on what's wrong?
    FYI, I currently have my antivirus disabled & not running in the task bar just in case that was interfering somehow.

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    Firefox never does crash, I can leave it in this hung state for hours (I left it in a 'not responding' state last night and it was still hung this morning).
    I was going to add a screen shot to this post but Firefox hung when I clicked on the 'Browse' button. Perhaps this is an issue when FF tries to interact with my directory structure? Does that get us any leads on what's wrong?
    FYI, I currently have my antivirus disabled & not running in the task bar just in case that was interfering somehow.

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