Forum Discussion
Altera_Forum
Honored Contributor
13 years agoI encountered similar issue before. Go to Device Manager, try manually add it to this path to the USB device:
C:\altera\12.1\quartus\drivers\usb-blaster-ii\ (not the one layer below e.g. x32 or x64). The system will pick up from .inf and the correct x86 driver from there.