Firefox will not start?

All of a sudden I can't get firefox to start on my laptop. I click on it and it comes up in the processes but just never starts. I ran avg virus, malwarebytes, and spyware terminator with no viruses or malicious software found. I also ran Eusing registry cleaner, no help. I then used restore to put the comp... show more All of a sudden I can't get firefox to start on my laptop. I click on it and it comes up in the processes but just never starts. I ran avg virus, malwarebytes, and spyware terminator with no viruses or malicious software found. I also ran Eusing registry cleaner, no help. I then used restore to put the comp back to when firefox was starting then removed and re-installed firefox (newest version but not the beta). Still nothing. It's a Toshiba with Win XP, 4GB ram, and plenty of disk space left. I did notice that when I'm looking at my processes, firefox was taking lots of memory (100k +) for awhile then would dip back down to 10k but not start. It also won't start in safe mode (firefox safe, not Windows) Any ideas?? Explorer works and my internet connection is fine but I'd rather get firefox running again.
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