Backing up the system state using NTBackup or Veritas Backup Exec may fail if you are having issues with the dll registrations for the Volume Shadow Copy service.
Running the vssadmin utility and using the “list writers” parameters returns nothing. The syntax "vssadmin list writers".
Usually this issue can be resolved by registering the dlls that are needed by the VSS service.
1. From command prompt:
Net stop vss
Net stop swprv
regsvr32 /i swprv.dll
regsvr32 /i eventcls.dll
2. After completing the registration of the DLL’s open an command prompt and type: vssadmin list writers
3. You should see the writers listed.
4. Open Ntbackup and attempt to backup file or systemstate.
Have a nice weekend.