The "ihv gui mui 64 access denied" error generally indicates a permission conflict when a 64-bit user interface component from an attempts to access protected system resources . This is common with drivers for Intel network cards or Dell/Alienware Support Assistant tools. Immediate Solutions
If you use a third-party suite (like Bitdefender, Malwarebytes, or Norton), check the protection logs to see if a background vendor GUI file was quarantined. ihv gui mui 64 access denied
Check and click Apply/OK.