- You have a Microsoft Windows Server 2008-based computer that has Hyper-V installed.
- You are running a Windows Vista Home Basic or a Windows Vista Home Premium virtual machine on the computer.
- You install Hyper-V Integration Services on the virtual machine.
- Mouse integration does not work correctly.
- An "Unknown device" is listed in Device Manager. A yellow circle with a black exclamation point on it appears next to the "Unknown device."
Additionally, you receive the following error message if you reinstall the Integration Services:
An error has occurred: One of the update processes has returned error code 1.