Description:
------------
For the time that I am on a Windows server, before I changeover to the wonderful Linux, I have been running the ISAPI module of PHP under IIS, because the sites being run are high traffic, production sites that require speed.

Every now and again, approx 1hr-36hrs, the machine will explode to FULL CPU and I would get the error message below in the Server Logs.  The CPU power would be taken up by the dll that runs the IIS PHP Isapi in protected web mode.  I would either have to restart IIS (if I can gain terminal access) or restart the server.

Upon searching the internet for other people with the same problem, I found many people - that still have not found a resolution to this problem.  I feel that my case is slightly different.

ERROR MESSAGE:

The HTTP server encountered an unhandled exception while processing the ISAPI Application '
php4ts!php_execute_script + 0x21F
 + 0x8B9B1B41
'. 
For additional information specific to this message please visit the Microsoft Online Support site located at: http://www.microsoft.com/contentredirect.asp. 

Reproduce code:
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The websites are using the well known PHP-Nuke scripts with MySQL Winnt on the same server.

Expected result:
----------------
The server to run stable.

Actual result:
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The Server page generation times would increase, the server cpu will go up to 100% usage.