۲To disable the "Disallow installation of printers using kernel-mode drivers" policy in Windows 7 (which blocks NT 4.0 drivers), open the Local Group Policy Editor (gpedit.msc), navigate to Computer Configuration > Administrative Templates > Printers, and set the policy to Disabled. Alternatively, modify the registry key HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print and set KMPrinters to 0.
Steps to Disable NT 4.0 Driver Policy
Method 1: Local Group Policy Editor
Click Start, type gpedit.msc in the search bar, and press Enter.
Navigate to: Computer Configuration > Administrative Templates > Printers.
Double-click Disallow installation of printers using kernel-mode drivers.
Select Disabled, click Apply, and then OK.
Restart the computer for the changes to take effect.
Method 2: Registry Editor
Click Start, type regedit, and press Enter.
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print.
Find the KMPrinters DWORD value. If it does not exist, create it.
Set the value to 0 to disable the restriction.
Restart the computer.
Method 3: Group Policy (Domain Environments)
Open gpmc.msc on a domain controller.
Edit the applicable Group Policy Object (GPO).
Navigate to Computer Configuration > Policies > Administrative Templates > System > Net Logon.
Disable the AllowNT4Crypto setting, if applicable, or manage printer restrictions via the Printer GPO settings.
Note: The use of NT 4.0 kernel-mode drivers is generally discouraged due to stability issues. As a safer alternative, it is recommended to use Type 3 or Type 4 user-mode drivers if available.
Steps to Disable NT 4.0 Driver Policy
Method 1: Local Group Policy Editor
Click Start, type gpedit.msc in the search bar, and press Enter.
Navigate to: Computer Configuration > Administrative Templates > Printers.
Double-click Disallow installation of printers using kernel-mode drivers.
Select Disabled, click Apply, and then OK.
Restart the computer for the changes to take effect.
Method 2: Registry Editor
Click Start, type regedit, and press Enter.
Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print.
Find the KMPrinters DWORD value. If it does not exist, create it.
Set the value to 0 to disable the restriction.
Restart the computer.
Method 3: Group Policy (Domain Environments)
Open gpmc.msc on a domain controller.
Edit the applicable Group Policy Object (GPO).
Navigate to Computer Configuration > Policies > Administrative Templates > System > Net Logon.
Disable the AllowNT4Crypto setting, if applicable, or manage printer restrictions via the Printer GPO settings.
Note: The use of NT 4.0 kernel-mode drivers is generally discouraged due to stability issues. As a safer alternative, it is recommended to use Type 3 or Type 4 user-mode drivers if available.
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