MS IIS7 - w3wp crash 0xff analysys approach and tool??

I have crashes in my w3wp process in IIS7.

Messages:
A process serving application pool 'DefaultAppPool' terminated unexpectedly. The process exit code was '0xff'.

And after a few of those:
A process serving application pool 'DefaultAppPool' suffered a fatal communication error with the Windows Process Activation Service. The data field contains the error number.

What is the approach to analyze such failures and which tool should I use?
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longjumpsAsked:
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compdigit44Commented:
The following articles contact great tips on troubleshooting w3wp.exe crashing and using the Debug Diagnostic Tool...

http://www.fromthefiefdom.com/troubleshooting-an-iis-w3wpexe-crash-with-ntd
http://blogs.msdn.com/b/david.wang/archive/2005/08/24/debugdiag-the-saga-to-rtm.aspx
http://blogs.iis.net/webtopics/archive/2009/11/25/how-to-collect-a-crash-dump-of-an-iis-worker-process-on-iis-7-0-and-above.aspx

Also, have any updates been installed lately?

As a test have you tried to increase the recycling of the app pools to see if this help??
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