Once you've fixed the issue, take these preventive measures on Windows 11:
Windows 11’s mandatory driver signature enforcement blocks unsigned or improperly signed rtknicdriverinstallersfxexe components. This is the #1 cause of "Windows cannot verify digital signature" errors. rtknicdriverinstallersfxexe windows 11 fixed
Steps for temporary disable:
Permanent disable (not recommended for security): Use bcdedit /set testsigning on in an admin Command Prompt. Revert with bcdedit /set testsigning off. Once you've fixed the issue, take these preventive
To avoid future issues with rtknicdriverinstallersfx.exe on Windows 11: Create a system restore point before any network
If you do not trust the file you have, let Windows find the specific INF file for you.