I've been searching for fixes for "Group Policy Client Service Failed the logon - Access Denied" for a while now and tried many of them with no success. I did find that in my case when a particular user (only one so far) tries to logon
a Windows 7 Pro 64 bit machine he gets the "Access denied" error. However on a Windows 7 Pro 64 bit machine he can logon with no problems (he can also logon to XP machines, i think they are 32 bit).
I have tried to fix his profile a few different ways. First I deleted his local profile, and he was able to logon with a temp profile until the computer was restarted, the access denied again. Then I edited his local machines registry ProfileList,
and still error. Finally I renamed his profile directory on the 2008 r8 server so it a fresh one could be created. The user then logged on another pc he hadn't logon before, again error. I can provide more info as to what I actually did if
The problems was discovered when we receive new 64 bit machines. As I began to deploy them one day the user showed me the error he was getting. For now I can get him on 32 bit machines, but was curious if there is a way to fix this on the 64
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