Error updating Firefox 5.0.5 to 5.1
I am working with Firefox 5.0.5 with my Windows 7 PC and it runs without issues. But when I update it to 5.1, it constantly failed. I can open the site but it is not working. It could not reload any website and just stopped working. I removed the entire Firefox set up that is already installed in my computer and start installing a fresh copy of it but with the same Firefox 5.1 version and yet the problem is still incurs.
So I downloaded a more updated version but the same thing happened.
What should I do next?
I am completely lost.








