psmounterex.sys driver blocklist

The psmounterex.sys driver blocklist tag covers Microsoft's decision to block vulnerable versions of the psmounterex.sys kernel driver via security updates like KB5083769. This action, applied to Windows 11, Windows 10, and Windows Server, prevents certain third-party backup tools from mounting or managing backup images. The recommended fix is updating the affected backup application rather than rolling back the Windows update. Discussions highlight the trade-off between improved platform security and the operational disruption for users whose backup software stops working. The tag focuses on the driver blocklist's impact, troubleshooting steps, and the broader implications for system administrators and IT professionals managing Windows environments.