Hate 4, Tried system restore to get version 3 back, now firefox won't open

After upgrading to ver. 4 I had to start using I.E. to use court report sites and county tax sites, and had other problems so I need to revert to ver.3
I did a system restore and now Firefox will not open. (vista home premium)

Here's the process to reinstall Firefox 3.6:
You can download an installer for Firefox 3.6 from http://www.mozilla.com/firefox/all-older
Before running it I recommend backing up your Firefox settings in case something goes wrong. See [https://support.mozilla.com/en-US/kb/Backing+up+your+information Backing up your information] (copy whole profile folder).
Close Firefox 4, and uninstall it. Do not remove your personal data and settings, just the program. Some people report it's okay to skip this step.
Then finally you can reinstall Firefox 3.6. Unless you have installed an incompatible add-on, it should pick up where you left off. If there are serious issues, please post back with details.
Note: I haven't actually tried this myself!
Finally, just a note that System Restore may have changed the registry settings from Firefox 4 to Firefox 3.6, but doesn't actually change the program files, so that could be why it's broken.

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