A test-signed driver package should install and load on Windows Server 2008 and Windows Vista without user interaction if the following conditions are true:

• The driver package complies with generic Windows Server 2008 and Windows Vista requirements.
• The driver package is signed and the signature is verified, as described in Test-signing Driver Packages.
• The driver package is not altered after it is signed.
• The test certificates that were used to sign the driver package are installed correctly on the test computer, as described in Installing a Test Certificate on a Test Computer.
• If a non-PnP driver has a signed catalog file instead of an embedded signature, the installation application that installs the driver has installed the catalog file in the system catalog root directory, as described in Installing a Test-Signed Catalog File for a Non-PnP Driver.

• Test-signing is enabled on the test computer.

For more information about troubleshooting installation problems, see Troubleshooting Driver Installation and Load Problems.