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#21
Well I tried to download ff portable, but it wouldn't download fully.
In the end, I uninstalled AVG and installed Microsoft Security Essentials. I changed the start up programs, and uninstalled Firefox 3.6 and downloaded FF6. Things are running slow, but I'll leave it for now as I need a break from staring at a computer screen.
Thanks everyone for your help, I'm going to mark this solved. Cheers.