Well I know that error code, it's the good old Access Violation, almost as helpful as having no error code at all. Anyway here are my thoughts:
Apparently this is most commonly caused by php crashing when running as a module, rather than apache itself: unfortunately it brings a worker thread down with it too. You might be able to improve the situation by switching to the FastCGI version of php (at least the dying php wouldn't bring down apache every time). However beyond this it boils down to DLL hell: there are so many variables that it can become impossible to diagnose the actual problem; a corrupt windows binary, a dodgy stick of RAM?
Try upgrading to the latest stable versions of apache and php; you'll also get more meaningful error messages with the debug builds. You could also give linux a try ;)
Hardware and performance
Apache Application Error
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