Windows 11 disables unsigned drivers by default. The Hioki 3197 driver is technically signed but may be flagged as legacy. Fix: Restart Windows 11, go to Settings > Update & Security > Recovery > Advanced Startup > Restart Now . Then select Troubleshoot > Advanced Options > Startup Settings > Disable Driver Signature Enforcement . Reinstall the software immediately after.
Read the agreement (standard terms) and click "I Agree." Hioki 3197 Software Download