Windows 2008, CF 9 and application pool that keeps shutting down

I am running Windows 2008, IIS 7.5 and Coldfusion 9 in a virtual environment using VMware.  Suddenly last week the application pool that this IIS instance uses keeps shutting down for no apparent reason.  This is in a development environment so there is really only a few people hitting it.

I wanted to see if anyone had any idea of why this might be happening.
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WebStalkersConnect With a Mentor Author Commented:
I ended up changing the default user on the application ppol from AppPoolIdentity to NetworkService and things have worked great now.  
does anything show up in the application event log?
WebStalkersAuthor Commented:
The only thing I can find is this:

Faulting application name: w3wp.exe, version: 7.5.7600.16385, time stamp: 0x4a5bd0eb
Faulting module name: ntdll.dll, version: 6.1.7600.16385, time stamp: 0x4a5be02b
Exception code: 0xc0000005
Fault offset: 0x00000000000159ad
Faulting process id: 0xe74
Faulting application start time: 0x01cae6de1a0b53c1
Faulting application path: c:\windows\system32\inetsrv\w3wp.exe
Faulting module path: C:\Windows\SYSTEM32\ntdll.dll
Report Id: 57cc2398-52d1-11df-b71c-005056af0fca

WebStalkersAuthor Commented:
Here is another thing I am noticing and not sure if this is related to this issue but I thought I would throw this out there. When I select this IIS 7.5 instance and go into 'Basic Settings' I select 'Test Settings'. I get an ok on the Authentication but I get an error on the 'Authorization'. 'Cannot verify access to path (D:\....'.

The server is configured to use pass-through authentication with a built-in account to access the specified physical path. However, IIS Manager cannot verify whether the built-in account has access. Make sure that the application pool identity has Read access to the physical path. If this server is joined to a domain, and the application pool identity is NetworkService or LocalSystem, verify that <domain>\<computer_name>$ has Read access to the physical path. Then test these settings again.
WebStalkersAuthor Commented:
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