Firefox will not run after System restore or running in compatibility mode for windows 98. How do I fix this? I already tried all other solutions on this site.

I was running Firefox fine just yesterday. I screwed up the registry a litle while removing an installed program completely, so I restored the system and everything appeared to work fine. I then decided to play an old video game, Return to Krondor, which was made back in 1998, so I ran the program with no other programs running in compatibility for windows 98. After finishing the game, I closed it and put the computer in hibernation mode. I come back today and firefox will not run at all. It is not running in the background and there are no programs running. There are no services running which could interfere with it. I think somehow Firefox may think I'm in compatibility mode still, but I have no idea.
I'm running windows Vista 32 - bit with an AMD 2.4ghz processor, 4gb ram on an Emachine computer. I have already tried system restore, restart, processes etc. Nothing works. I can still run Internet explorer and all other programs.

The person that I was assisting, has Windows 7 which has 64 bit system. Her browser was IE 10.
Was IE11 ever offered (or installed) via Windows Update?
Is her computer currently fully-patched at Windows Update?
Is Adobe Shockwave Player v12.1 (or higher) installed on her computer?
Is Adobe Flash Player v15.0.0.189 (or higher) installed on her computer?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Troubleshoot Shockwave Player installation for Windows
http://kb2.adobe.com/cps/403/kb403264.html
You will find support for Shockwave Player in this forum:
http://forums.adobe.com/community/webplayers/webplayers_shockwave
~Robear Dyer (PA Bear) MS MVP-Windows Client since 2002 Disclaimer: MS MVPs neither represent nor work for Microsoft

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