Windows server 2008 backup error code '2155347997'

Hi,

We are configured windows server 2008 machine as our domain controller. And the backup was configured for system state with windows backup. It is going to a share folder. It was working perfectly but now it is getting an error says that "The backup operation that started at '‎2011‎-‎11‎-‎22T20:00:06.743827000Z' has failed with following error code '2155347997'. Please review the event details for a solution, and then rerun the backup operation once the issue is resolved."

Error in backup of C:\Windows\winsxs\wow64_microsoft-windows-scripting-vbscript_31bf3856ad364e35_6.1.7601.21663_none_b1273ff5922e61ad\vbscript.dll during write: Error [0x8007048f] The device is not connected.