We have a recently imaged a group of workstations with Windows 7 using SCCM 07.
Myself and other administrators can log in to the machines but regular accounts cannot.
We elevated a normal account to administrator and it was not able to log in.
Here are the errors from the event log
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> - <System><Provider Name="Microsoft-Windows-User Profiles Service" Guid="{89B1E9F0-5AFF-44A6-9B44-0A07A7CE5845}" /> <EventID>1500</EventID> <Version>0</Version> <Level>2</Level> <Task>0</Task> <Opcode>0</Opcode> <Keywords>0x8000000000000000</Keywords> <TimeCreated SystemTime="2011-01-25T19:22:08.724507600Z" /> <EventRecordID>1425</EventRecordID> <Correlation /> <Execution ProcessID="952" ThreadID="2792" /> <Channel>Application</Channel> <Computer>xxxx</Computer> <Security UserID="S-1-5-21-3380481182-2311050411-4097259448-9173" /> </System> - <EventData><Data Name="Error">The system cannot find the file specified.</Data> </EventData></Event><Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> - <System><Provider Name="Microsoft-Windows-User Profiles Service" Guid="{89B1E9F0-5AFF-44A6-9B44-0A07A7CE5845}" /> <EventID>1520</EventID> <Version>0</Version> <Level>2</Level> <Task>0</Task> <Opcode>0</Opcode> <Keywords>0x8000000000000000</Keywords> <TimeCreated SystemTime="2011-01-25T19:22:08.724507600Z" /> <EventRecordID>1424</EventRecordID> <Correlation /> <Execution ProcessID="952" ThreadID="2792" /> <Channel>Application</Channel> <Computer>xxx</Computer> <Security UserID="S-1-5-21-3380481182-2311050411-4097259448-9173" /> </System> - <EventData><Data Name="Error">The system cannot find the file specified.</Data> </EventData></Event>