When you try to perform a backup on a computer that is running Windows Vista or Windows Server 2008. However, the backup stops immediately after it starts. Additionally, the following event is logged in the Application log: Event ID: 12293 | Source: VSS | Message: Volume Shadow Copy Service error: Error calling a routine on a Shadow Copy Provider. “Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page,” Microsoft explained in KB972135.