The basic problem will be a file (or registry key) that it can't read, the best way to debug is to use Process Monitor and capture a logon trace, as per http://blogs.technet.com/b/markr....If you migrated a profile, the problem probably lies in permissions (possibly inside the NTUSER.DAT registry hive or the profile directory), or in the path to the profile in HKLMMicrosoftWindows NTProfileList.u00a0 Either way, a logon trace should tell you exactly where it is failing.