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To promote and advance the quality of drivers, to provide a better user experience, and to reduce support costs for vendors and total cost of ownership (TCO) for customers, Microsoft has begun digitally signing drivers that pass the Windows Hardware Quality Labs (WHQL) tests. Such certification proves to users that the drivers they employ are identical to those Microsoft has tested, and flags any changes after a product is put on the Hardware Compatibility List.
Driver Signing operates as a driver is installed, rather than as a system boots. The three primary categories of driver verification can be simply described as Fail, Warn, and Ignore. Fail prevents unsigned code from being loaded. Warn provides a prominent message to tell the user that unsigned code is being loaded. Ignore loads drivers without notification, if the user or administrator so chooses. Driver Signing is configurable through a control panel to allow different types of drivers to be treated differently; for example, video drivers can operate in Warn mode, while network drivers operate in Fail mode.
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