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Firefox fails to open, complaining about corrupt mozcrt19.dll everytime.

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Everytime I try to open my firefox 3.6.3 it fails and instead an error message appears stating that "mozcrt19.dll" is not a valid image. I'm running windows XP. Firefox has been running fine for me for over an year now on the same machine and same OS. Uninstalling firefox and reinstalling firefox from mozilla site has not helped at all.

User Agent

Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; MS-RTC LM 8)

Everytime I try to open my firefox 3.6.3 it fails and instead an error message appears stating that "mozcrt19.dll" is not a valid image. I'm running windows XP. Firefox has been running fine for me for over an year now on the same machine and same OS. Uninstalling firefox and reinstalling firefox from mozilla site has not helped at all. == User Agent == Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; MS-RTC LM 8)

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i just encounter this yesterday, is on one of the old computer of my office, it appear after added a 256mb ram. anyone able to help us?