I have a access database sitting on a server accessed by several workstations. One of them is a new workstation with MS Windows XP Professional on it. When the user uses the combo box on a form to lookup a record, about the 2nd or 3rd time, the Windows Restart window appears! The user can cancel out of the Restart window but then each time a lookup is performed, up comes the restart window! Closing the database and re-opening it clears the problem but then after 2 or 3 lookups, it starts again - any thoughts? 
