

Though disabling this policy can be done by modifying the registry, but it is easy and recommended to do via MMC GUI. Follow the steps to disable NT4.0 drivers policy How to Install NT 4.0 Printer Drivers in VistaĪs mentioned in the error message ‘policy enable on your computer that blocks NT 4.0 drivers’ hence we can disable the policy on Windows Vista computer. Otherwise, it fails with the “The printer driver is not compatible with a policy enabled on your computer that blocks NT 4.0 drivers” message. So, if the Windows NT 4.0-based computer which is sharing the printer is having the ‘User mode printer drivers’ or Windows Vista can map for the user-mode printer during the installation, then the printer driver installation will be succeeded. Windows Vista supports ‘user mode printer drivers’ only, Microsoft explains it here. Windows Vista does not support ‘kernel-mode printer drivers’ for installation.

This problem mostly occurs when you try to connect the old printer with old print drivers from Windows Vista PC.
