After installing or upgrading to Endpoint Protection 9.1 on Windows 2000 the system enters a reboot loop. The following error message is given:
"Could not complete the installation or update due to an unexpected error".
The latest Endpoint Protection version requires a specific version of a Windows DLL not present in Windows 2000. To solve this issue you will have to copy psapi.dll from a Windows XP system to the following folders on your Windows 2000 systems (before or after the install/upgrade):
and then perform a reboot.