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Firefox crashes

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Firefox will not start and crashes immediately on startup. I have reinstalled firefox and restarted my computer with no effect.

I have started Firefox in safe mode and disabled all add ons and reset everything but this has had no effect either.

I cannot use firefox at all.

Firefox will not start and crashes immediately on startup. I have reinstalled firefox and restarted my computer with no effect. I have started Firefox in safe mode and disabled all add ons and reset everything but this has had no effect either. I cannot use firefox at all.

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Your crashreport:
https://crash-stats.mozilla.com/report/index/bp-7ae8ff4b-e039-426b-a328-7d1c52111104
Firefox 7.0.1 Crash Report [@ _purecall | nsXPTCStubBase::QueryInterface(nsID const&, void**) ]
This is caused by Trusteer Rapport. Try to disable it and see if that stops the crashing.
You can stop Rapport using Start Menu > Programs > Trusteer Rapport > Stop Rapport
You can ask their helpdesk when an updated version of their product will be made available or, if you don't need this software, uninstall it.
http://www.trusteer.com/support/en/report-problem
According to the user in question 892517 Trusteer is aware of the problem and working on a fix.
See also Bug 699776 - crash in nsXPTCStubBase::QueryInterface involving RapportTanzan7.dll in the stack.