I cannot systemstate backup!!!!!

This is my event viewer:
Tipo de suceso: Advertencia
Origen del suceso:      Userenv
Categoría del suceso:   Ninguno
Id. suceso:     1524
Descripción:
Windows cannot unload your classes registry file - it is still in use by other 
applications or services. The file will be unloaded when it is no longer in use

Tipo de suceso: Error
Origen del suceso:      NTBackup
Categoría del suceso:   Ninguno
Id. suceso:     8019
End Operation: Warnings or errors were encountered. Consult the backup report 
for more details.


Tipo de suceso: Error
Origen del suceso:      VSS
Categoría del suceso:   Ninguno
Id. suceso:     8193
Descripción:
Volume Shadow Copy Service error: Unexpected error calling routine
RegSaveKeyExW.  HR = 0x800703e6.


- The backuplog:

"Registry Writer" has reported an error 0x800423f4. This is part of System 
State. The backup cannot continue.
Error returned while creating the volume shadow copy:800423f4
Aborting Backup.

Could You help me?

Thanks!

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