Cause: The installer may be stuck extracting or scanning hardware.
Fix: Kill the process via Task Manager, then delete %TEMP%\Qc* folders.
Cause: Driver signature enforcement blocks installation. Fix: Reboot Windows with driver signing disabled (Advanced Startup → Disable Driver Signature Enforcement). Qc1051deu-x64.exe
If you did not deliberately download this file, it may have arrived through one of the following legitimate channels: Cause: The installer may be stuck extracting or