Restart your PC. Press F8 during boot. Select Disable Driver Signature Enforcement . (The 3.21 driver is not digitally signed by modern standards).
We cannot host copyrighted drivers here, but if you contact your original software vendor (the company that sold you the CAD/ERP software), they are legally required to provide you with the legacy driver package you paid for. hasp hl 3.21 driver windows 7 download
Drop a comment below with the name of your software (e.g., "Allegro PCB Designer 16.3"), and the community might point you in the right direction. Restart your PC