In Windows Defender or your third-party Antivirus (McAfee, Norton, etc.), add the Parashara’s Light installation folder (usually C:\PL90 ) to the "Exclusions" list.
Unplug the dongle, wait 10 seconds, and plug it into a different USB port (preferably one directly on the motherboard if you are using a desktop).
If you are using the version of 9.0 that does not require a physical USB key (Software License), the "Hardware Key Not Found" error usually implies the has crashed. Go to http://localhost:1947 in your web browser.
Before diving into software settings, rule out hardware failure:
Ensure the status is "Running." If it’s stopped, right-click it and select . Set the "Startup Type" to Automatic . Step 4: Configure Antivirus and Firewall