GP's not applying, RSOP fails, Vista will not log off/shut down

[CBT]

When I try to run GPUPDATE, it hangs there and eventually says it has stopped
responding. If I try to run RSOP it also stops responding. When I try to shut
down or log off, I get stuck at Logging Off, I have left it for hours. I
eventually have to power off the machine to get it back up.

I have the following errors in the event logs

Log Name: Application
Source: Group Policy Scheduled Tasks
Date: 3/27/2009 8:36:43 AM
Event ID: 4099
Task Category: (2)
Level: Warning
Keywords: Classic
User: SYSTEM
Computer: IT1.community.com
Description:
The client-side extension could not log RSoP data because it failed with
error code '0x8004401e <unknown-message-text>'.
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Group Policy Scheduled Tasks" />
<EventID Qualifiers="34305">4099</EventID>
<Level>3</Level>
<Task>2</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2009-03-27T13:36:43.000Z" />
<EventRecordID>1610</EventRecordID>
<Channel>Application</Channel>
<Computer>IT1.community.com</Computer>
<Security UserID="S-1-5-18" />
</System>
<EventData>
<Data>0x8004401e <unknown-message-text></Data>
</EventData>
</Event>

Log Name: Application
Source: Microsoft-Windows-Winlogon
Date: 3/26/2009 5:03:41 PM
Event ID: 6005
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: IT1.community.com
Description:
The winlogon notification subscriber <GPClient> is taking long time to
handle the notification event (Logoff).
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Winlogon"
Guid="{DBE9B383-7CF3-4331-91CC-A3CB16A3B538}" EventSourceName="Wlclntfy" />
<EventID Qualifiers="32768">6005</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2009-03-26T22:03:41.000Z" />
<EventRecordID>1585</EventRecordID>
<Correlation />
<Execution ProcessID="0" ThreadID="0" />
<Channel>Application</Channel>
<Computer>IT1.community.com</Computer>
<Security />
</System>
<EventData>
<Data>GPClient</Data>
<Data>Logoff</Data>
<Binary>C8075701</Binary>
</EventData>
</Event>

Log Name: Application
Source: Microsoft-Windows-Winlogon
Date: 3/26/2009 5:02:40 PM
Event ID: 6006
Task Category: None
Level: Warning
Keywords: Classic
User: N/A
Computer: IT1.community.com
Description:
The winlogon notification subscriber <GPClient> took 600 second(s) to handle
the notification event (EndShell).
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
<Provider Name="Microsoft-Windows-Winlogon"
Guid="{DBE9B383-7CF3-4331-91CC-A3CB16A3B538}" EventSourceName="Wlclntfy" />
<EventID Qualifiers="32768">6006</EventID>
<Version>0</Version>
<Level>3</Level>
<Task>0</Task>
<Opcode>0</Opcode>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2009-03-26T22:02:40.000Z" />
<EventRecordID>1582</EventRecordID>
<Correlation />
<Execution ProcessID="0" ThreadID="0" />
<Channel>Application</Channel>
<Computer>IT1.community.com</Computer>
<Security />
</System>
<EventData>
<Data>GPClient</Data>
<Data>600</Data>
<Data>EndShell</Data>
<Binary>C8075701</Binary>
</EventData>
</Event>