Firefox 4 and 5 load fine but will not start. I have done all the things it says in help including removing the firfox items in the Proceses tab but it still will not run.

I had firefox 4 which worked fine and I downloadd 5 now neither will run and I have done the things it says in help

I am having a similar problem. Running Xp.
Latest revision of firefox.
After using firefox for a while if I exit, parent.lock is locked and i have to reboot to reload firefox.
I have killed all firefox applications from task manager (usually there are none). and I have tried 3 different "file unlock" programs including unlocker to no avail.
I also recently installed a program that shows -all- open files, and parent.lock is not listed, and thus not closable/unlockable from there.

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