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first of all you need to provide the error code appears on backup exec console and it links to Symantec KB,, anyway the below may help
VSS Writer Errors:
1st link- the Microsoft article826936 talks about timeout errors, this is not what I'm seeing.
2nd link - This link does not seem to work - it just says The URL you've tried isn't returning content.
MS VSS Fixes and Updates:-
Windows Server2008 & SP2
975928 - parallel backups - I only1 backup running so this probably doesn't apply.
975688 - snapshot corrupted - the snapshot doesn't even get created.
983425 - many volumes - Only3 volumes on this server.
953531 - stop error0x0000007E - no stop errors.
However, by chance I happened to enable the Shadow Copy feature for the C drive. I believe this is disabled by default when Windows is installed. None of the other servers I support have this option enabled on the C drive.
The test backup I was running just doing System State now runs ok. I am trying a full backup to see if that completes as well.