Prevent Profile In HKEY_USERS From Unloading After Logoff

2003 server:
1. Add the user whose SID you wish to remain loaded in HKU to the following registry location: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UPHClean\Parameters\USER_EXCLUSION_LIST. The format should be netbiosdomainname\username (or hostname\username for local accounts).
2. Restart the User Profile Hive Cleanup service.

2008 Server:
1. Go to the following location in group policy editor: Computer Configuration > Administrative Templates > System > User Profiles
2. Set the "Do not forcefully unload the users registry at logoff" to Enabled.
3. Apply the updates (gpupdate)