"Failed to take a VSS snapshot for the active directory backup" on Windows 2008 DC (4046063)

Date - April 2010
Affected Product & Version - NetVault 8.2.0 Build 23 R2008SEP26-GENUS
Affected Module & Version - File System plugin 7.4.14
OS Version - Windows 2008 Domain Controllers
Application Information - Active Directory and System State

Symptoms:
System State backups on Windows 2008 Domain Controllers running NV8.2.0, fail on backing up
the Active directory part of the System State, if the Active Directory Database and log files are installed on
other drives than C:\.

The log would show the following messages or warnings:

Warning 2010/03/23 17:15:39 4539 Data Plugin DC1 Failed to take a VSS snapshot for the active directory backup
or
Error 2010/03/01 11:55:39 1793 Data Plugin DC1 Failed to create VSS snapshot
Error 2010/03/01 11:55:39 1793 Data Plugin DC1 An error occurred when processing the final tree of items to backup
Severe Error 2010/03/01 11:55:39 1793 Data Plugin DC1 Failed to prepare the selection tree and backup options
Error 2010/03/01 11:55:39 1793 Jobs netvault1 Fatal error: Backup failed

File System trace from the client show:
0 VSSUTIL :3976 36 0 124406 - FAILED_AT_POST_SNAPSHOT status for writer 'NTDS'. Writer error code: VSS_E_WRITERERROR_NONRETRYABLE [0x800423f4]
1 VSSUTIL :3976 39 0 124406 GetPreRestoreFailureMsg(): ret S_FALSE
0 VSSUTIL :3976 40 0 124406 Error is (null)
0 VSSBACK :3976 60 0 124406 **** VSS Return code: (null)
0 ADVSS :3976 1077 0 124406 Failed to take the VSS snapshot
3 LOGGING :3976 14 0 124406 'Failed to take a VSS snapshot for the active directory backup'
0 NVFSWIN :3976 537 0 124406 Failed to backup system state item type 1013004

At times the trace would reveal the following:
1 NVFSWIN :5848 669 0 105546 VSS wanted for job. Try init...
2 VSS :5848 675 0 105546 TRUE = NvFsVSSAvailable()
1 LICENSE :5848 137 0 105546 Loaded ca