IIS stops responding, server needs to be restarted

We have a webserver running Windows 2003 SP2.

After a memory upgrade(2gb to 4gb), IIS stops responding and the only way to get it back is to restart the server.

Some errors on event viewer:

Reporting queued error: faulting application w3wp.exe, version 6.0.3790.3959, faulting module w3core.dll, version 6.0.3790.4616, fault address 0x00004e2e.
EventID 1004

A process serving application pool 'AppPool Site CCE' terminated unexpectedly. The process id was '5004'. The process exit code was '0xc0000005'.

A process serving application pool 'AppPool Site CCE' terminated unexpectedly. The process id was '3728'. The process exit code was '0x1'.

After restarting the server, during the days we got some AppPool errors on event viewer. And after a week(3d time this happens) IIS stops responding. Restarting the service, restarting the AppPool, nothing works, only restarting the PC.

I installed Debug Diagnostic Tools and created a rule monitoring the Application Pool but the log shows nothing...

Any thoughts?
Suporte CCESystem AdministratorAsked:
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What version of Server 2003 are you running? (i.e. web edition, enterprise, standard, datacenter, etc...).
Suporte CCESystem AdministratorAuthor Commented:
Standard SP2.
Is the Identity for the application pool you are having issues with running with Configurable (i.e. an IWAM account, or an account created to run it), or is it one of the predefined accounts. If you havnt tried to set it to use the IWAM account I would reccomend trying that.
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Suporte CCESystem AdministratorAuthor Commented:
We are using the predefined "network service"

You´re sayin to change to "configurable" and set IWAM account? Im gonna try that.

Just for information, whats the difference?
Suporte CCESystem AdministratorAuthor Commented:
Still having this issue. It´s not permission because everything on the site works fine for a week. Anyone else has any thoughts?
Suporte CCESystem AdministratorAuthor Commented:
Please close the topic. We isolated the DLLs on different Application Pools and find out wich one was causing the error.

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Microsoft IIS Web Server

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