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ERROR_PRINTER_DRIVER_BLOCKED
AddPrinterDriverEx documents this code when a printer driver has known problems and does not work on the operating system. It is stronger than ERROR_PRINTER_DRIVER_WARNED: the documented warned-driver path has an explicit APD_INSTALL_WARNED_DRIVER option, while the blocked-driver result represents a compatibility refusal.
Treat the exact driver package as the remediation unit. Copying the same files again, restarting the spooler, or changing the printer port does not change the operating system's compatibility assessment of that driver.
Replace the blocked driver deliberately
- Capture the driver name, version, provider, environment, package identity, and Windows build where installation was refused.
- Locate a supported package or an appropriate inbox/modern driver for the device and test queue behavior before migration.
- When replacing a shared-server driver, enumerate queues that use the old driver and plan their transition rather than deleting the package first.
- Keep this status separate from legacy NT 4.0 kernel-driver policy failures reported as ERROR_KM_DRIVER_BLOCKED.
AddPrinterDriverEx blocked-driver behavior · Print driver packages · Printer Driver Installation Reference
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