今天，微軟發布了Vista在驅動簽名方面與XP的差別比較。XP中，驅動被分為3個級別：

1. In-box drivers are given first preference.
2. Windows Hardware Quality Labs (WHQL) signed drivers next.
3. Unsigned drivers are given lowest preference.

而Vista則大大擴展為8個分級：

1. Microsoft signed WHQL Certified Drivers.
2. Microsoft signed in-box drivers (NT Build Lab Certified).
3. Microsoft signed Windows Sustained Engineering Certified drivers.
4. Drivers that have been signed using Authenticode (Enterprise CA).
5. Drivers that have been signed using Authenticode (Class 3 CA Certified).
6. Drivers that have been signed using Authenticode (MAKECERT.EXE Certified).
7. Microsoft signed WHQL Certified drivers for a down level Windows Operating system.
8. Unsigned Drivers.

當驅動被安裝時，這些行為判斷結果會記錄在setupapi.dev.log日志文件中。更多信息：http://blogs.msdn.com