vI have an Eee notebook and each time Firefox automatically updates, I can't get on the internet and have to do system restore to un-update Firefox. How do I fix this?

Firefox auto-updates and then will not run on Eee PC. I either want to know how to turn off auto-update or somehow get the new version of Firefox to work on my Eee PC. == This happened == A few times a week == Every time Firfox auto-updates