MSHTML.DLL Crash

Hi,

I have in my company an application developed by my own company. Its a .NET application.

Under some circunstances, it crashes with the following event in event viewer:

Name of the module with errors: mshtml.dll, version: 8.0.7601.17514, timestamp: 0x4ce7b8f3
Exception code: 0xc0000005
Error offset: 0x002ac98c
Process ID with errors: 0x1b60
Module with error path: C:\Windows\SysWOW64\mshtml.dll

I'm getting crazy with this error. Disable DEP doesn't solve the problem. But if the application is run with a user who is member of local Administrators group, it doesn't crash. If the user is not member of Local Administrators group, it always crashes in the same point.

I have googled, and found some updates to apply, but I have the latest patches, and, I think if it were a problem of patches, the problem would happen both with normal users and local administrator users.

Any clue on what to research?

The system is Windows 2008 R2 SP1 and Internet Explorer 8.0.7601.17514

Thanks in advance.