Firefox suddenly stopped responding. I couldn't close Firefox, then restarted my computer. When I did, Firefox constantly gives "Not Responding"; will not start. I tried reinstall, and am getting a stalled installation. What can I do?

OS: Windows XP
Numerous crashes out of Firefox in recent uses, before this latest catastrophic crash.
Installation is also stalled.
I cannot open any Firefox window and have it find the internet now, so am stuck using Internet Explorer to log in here.
Past crashes have been about once every 18 hours, not including some crashes of Flash roughly every 3-5 days.
Should add that I couldn't kill any Firefox process using the Windows Task Manager, which is a first. And, (re-)install hung for more than an hour now, not proceeding.
Norton scan showing no viruses, and it has the latest definitions. This seems confined to a problem in Firefox.
Trying again to install and get this running, trying to open Firefox again fails, using what I presume was the latest previous install. I can't re-install still.
I did briefly see a program called SysFader trying to run when I was opening the Firefox window (unsuccessfully), but just did a search in my hard drive for a file or folder named SysFader and there are no matches. I don't know if they are related.
Nearly a day later and no apparent progress.

(Moved content to main question area.)

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