programmer only sees ethernet blaster, not usb blaster

In Quartus programmer, don't click the "Add Hardware" button - that is specifically to add Ethernet blaster hardware (not to add USB blaster) and so will always bring up the Ethernet blaster screen.

All you need to is select the USB blaster you want to use from the "Currently Selected Hardware" dropdown menu and click close.

If your USB blaster is not showing up in the list, check that the device is showing in Device manager as installed and working. If it is missing the driver, update the driver in dev manager by selecting the option to manually specify driver, then select the "C:\altera\<version>\quartus\drivers" folder (check the include subfolders box), and windows will do the leg work to find the correct driver in that folder. If your device is installed and working but not showing in QP, make sure the "Altera JTAG Server" service is running in the windows services.

If all else fails, try reinstalling Quartus (the JTAG server can sometimes get corrupted, full uninstall/reinstall is the best way to clean that up).