As this is a FF problem thread. I have Java run time problems, MS Java doesnt work with FF so I have Sun Java which is horrid. As for your problem, try re-installing FF?
From the looks of that, i'd say that your HD may need checking. If you have some bad/dodgy sectors on the HD, that could cause any prog to mess up if it resides in that part of the HD. Run a scandisk and see how things go from there. That error msg points to your hd.
Right click your HD (C:\) Properties Tools Click 'Error checking' Select the two boxes - Start Reboot at prompt