Note: regsvr32 works only for self-registering COM DLLs. Why: System corruption can indirectly break DLL loading.
Below are focused, actionable steps to diagnose and fix errors involving the file smartkey.dll reported by ECM Titanium (or related tuning software). Use the steps in order; each step includes concise examples or commands where helpful. ecm titanium smartkey.dll error fix
sfc /scannow DISM /Online /Cleanup-Image /RestoreHealth Reboot after completion. Why: If issue is specific to your Windows user or machine. Note: regsvr32 works only for self-registering COM DLLs