Are you using Window 10? If it so, can you follow the steps below to have your USB Blaster configured properly?
1 - Go to windows 10 settings and search for "advanced startup options"
2 - Under Advanced startup, hit "Restart now"
3 - After a moment, you'll get a "choose an option" screen - choose "Troubleshoot", then "Advanced options", then "Startup Settings"
4 - You'll get a screen telling you what you will be able to change and a single "Restart" button - press it.
5 - If your boot drive is BitLocker encrypted, you'll need to enter the recovery key (press return, enter the key in the text box then hit return again - it took me three goes to realize I had to hit return before I could enter they key !)
6 - You'll be given a menu of options, number 7 disables driver signature enforcement
7 - When the PC restarts, use Device manager to update the drivers - this time you'll get a warning about the signature, but they install fine.
8 - When you've finished, restart normally to re-enable signature enforcement