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Version 4.0 wont work and I cant uninstall it

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How can I uninstall 4.0 andf get 3.6 back. I'm running windows XP

How can I uninstall 4.0 andf get 3.6 back. I'm running windows XP

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Go to the Control Panel and uninstall Firefox. Then go to the Temp folder where Firefox .exe files were downloaded to. Delete Firefox 4 file and double-click on the latest of the other .exe files that you should still have there. Also, look in your Recycle Bin. One of your old files might still be there.

I try to always download files from the Mozilla page. That way, I always have backup install files.

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It will not allow me to uninstall the program. I get the same message "your computer must be restarted"