Look Preferences are not saved and try step by step.

thank you

Please mark "Solved" the answer that really solve the problem, to help others with a similar problem.

Sorry didn't work. I did know about how to do this before I had the problem but I did like to have it completely restated as you listed it (thanks). This is always tied to windows 7 on this particular machine. My other system does not have this issue and its windows 7 also. Both have the exact same settings and software installed but the one is 1 year older and slower but has no problems. Both are from the same manufacturer. I would have accessed it and used all its setting but It is 500 miles away and not turned so I cannot access its files. This system far exceeds any recommended system requirements for Firefox. I so far have uninstalled it and reinstalled it at least 40 or 50 times through Jan 2012 and just know have been able to get it to work. I have also uninstalled any software that could have caused any problem without success. This time I left everything running performed all sort of upgrades for windows, ran a cleaner, left Zone Alarm Extreme Security Running and installed add-ons to the browser(Firefox 10). Seems this time to want to work. Personally I think it all windows 7 64 bit problem. No matter what I do with this its seems to go against any rational troubleshooting. Please any other thoughts. There has to be a key to the problem hidden somewhere. Just like when tech help says it will fix it or it will not and you find that its not the case and something else is the culprit. Usually something very simple. Any ideas or help is appreciated as I really want to understand why the fixes are not working.

Thanks Very Kindly Bob

If you use ZoneAlarm Extreme Security then disable Virtualization.
You may need to reinstall Firefox.

• http://kb.mozillazine.org/Browser_will_not_start_up#XULRunner_error_after_an_update
• [/questions/880050]

Thanks for your input, didn't think about about the Virtualization . For some reason this dang thing has started working and working correctly and I did it as listed in a previous reply. Probably should not have worked but it did. This is why I still think its some hidden setting or corrupt file I can't find possibly inside windows 7 itself. Going to try disabling the Virtualization if this continues to be a problem. Thanks very kindly for your input. Your help will be added to possible solutions. Also Fix it Cleaner has a setting that will modify your Virtualiation or adjust it.(Completely fouls up Firefox has been my experience so if you have it uncheck the optimize internet options and do it manually under tools using the Cleaner so you can control what its trying to foul up) Once again thanks very much for your help.