Windows Update V5 Downloads update but fails to install it

Windowsupdate log file shows

GetUserTokenFromSessionId failed with hr 0x800704dd
2005-02-16 17:12:31+1100 1236 4e4 WU client failed installing updates with
error 0x80240020
2005-02-16 17:12:31+1100 1236 4e4 WU client calls back to install call
{5B7E406D-0C69-4287-BB33-CE5EA43C98AA} with code Call failed and error
0x80240020
2005-02-16 17:12:31+1100 1236 4e4 WU client completed and deleted call
{5B7E406D-0C69-4287-BB33-CE5EA43C98AA}
2005-02-16 17:12:32+1100 3280 b44 Operation completed due to earlier error.
(hr=80240020)
2005-02-16 17:12:32+1100 1236 6a8 ISusInternal API failed
CClientCallRecorder:isconnectCall with error 0x8024000c
2005-02-16 17:12:32+1100 3280 b44 ISusInternal:isconnectCall failed,
hr=8024000C

Anyone any ideas what the error codes mean - they don't come up on a search
at Technet