What's the exact error message you're getting? If you would like to post a screen capture of the message, this article has tips on that: How do I create a screenshot of my problem?

If you think it would help, you could provide an address for the page and describe the steps to create the problem.

Hi Jscher at the moment i am not getting the message now because i have installed the us firefox this time but the other question i had do i need to remove the adobe flesh player and java before uninstalling firefox all do i just remove the addons under the firefox program from Neil

Hi Neil1979, no, you do not need to remove the Java or Flash plugins before uninstalling or reinstalling Firefox. Those install independently, and Firefox finds out that you have the plugins on your system using information the Java and Flash installers add in the Windows registry.

If you are uninstalling Firefox, please beware of the option to remove personal data, because that includes your bookmarks and there is no "undo" for removing it.