Black or blue background after you log on to a computer that is running Windows 7 or Windows Server 2008 R2

This issue occurs when a new drive is added to the system while background services are still starting. The most common example of this is with Microsoft Application Virtualization Client. When this service starts, it creates a virtual drive. When this drive is created during system startup, the Server service may crash the shared service host process. This process contains other services which are important for completing user logins. When these services fail at startup, a blue or black background image is displayed instead of the user’s desktop.

A hotfix is available on Microsoft website




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