Previous incomplete uninstalls leave registry keys under HKLM\SOFTWARE\Intel\ with permissions that prevent overwriting.
If the GUI (ihv gui mui) part is failing, bypass it by installing the driver only, then add the GUI later. ihv gui mui 64 access denied hot
Some advanced users report that a specific registry key controls IHV MUI access. Warning: Back up your registry first. Why this works: Some Intel installers require Write
This solves 30% of cases.
Why this works: Some Intel installers require Write access to HKLM and system directories that even a standard admin token doesn't have without elevation. ihv gui mui 64 access denied hot