Win 7 Clean install Firefox 7.0 install ok, but when trying to start Firefix, get error- "XULRunner "Couldn't load XRE functions.""

Tried turning off antivirus/antispyware - nstill get error msg.
Also have Thunderbird installed.

When you say "clean install", do you mean that you also manually erased the C:\program files\mozilla firefox folder before installing, to remove any remaining files from a previous install?
If so, it seems there is a problem with your profile. Have a look at https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting, and perhaps more specifically https://support.mozilla.com/en-US/kb/Basic%20Troubleshooting#w_8-make-a-new-profile and follow the instructions there for how to test if the problem goes away with a new profile.
Just post back here if you have questions.

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