Driver_IRQL_Not_Less_Or_Equal - Minidump attached

I have a Windows Server 2008 64bit Datacenter edition server running in a VMWare Server 2 environment with a RHEL 5 host. I have just set this machine up, and I'm getting a blue screen, seemingly at random. The message is "Driver_IRQL_NOT_LESS_OR_EQUAL." I had this same issue with a Server 2003 VMWare guest on the same physical host machine.

I'm also seeing the following:

Activation [N5Vmomi10Activatio

nE:0x1333b060] : Invoke done on

Throw vmodl.fault.SystemError

Result:

(vmodl.fault.SystemError) {

dynamicType = ,

reason = "Unknown error",

msg = ""

}

The server is an Active Directory Domain Controller. It also hosts the DNS and IIS roles, and is protected by Symantec Endpoint Protection. Attached are some of the minidump files from the Server 2003 installation. What other information, logs, etc can I provide to help with the diagnosis? It is somewhat important that I get this working properly, so any help would be much appreciated. Thanks!

Best Regards,

Martin Schultz