Runtime error will not allow firefox to start

I have Firefox 3.6
Whenever I try to open the browser, I get an error message that says Runtime Error!
Program: C:\Program Files (x86)\Mozilla Firefox\firefox.exe
This application has requested the Runtime to terminate it in an unusual way. Please contact the application's support tema for more information.
Is there any way that you can help me with this situation?

Start Firefox in [[Safe Mode]] to check if one of the add-ons is causing the problem (switch to the DEFAULT theme: Tools > Add-ons > Themes).
* Don't make any changes on the Safe mode start window.
See:
* [[Troubleshooting extensions and themes]]
* [[Troubleshooting plugins]]
If it does work in Safe-mode then disable all extensions and then try to find which is causing it by enabling one at a time until the problem reappears.
* Use "Disable all add-ons" on the [[Safe mode]] start window to disable all extensions.
* Close and restart Firefox after each change via "File > Exit" (Mac: "Firefox > Quit"; Linux: "File > Quit")

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