HPIB and GPIB are the same thing (IEEE-488 standard), and USB-GPIB interfaces are indeed available. The catch is getting software to talk to the GPIB interface

HPIB and GPIB are the same thing (IEEE-488 standard), and USB-GPIB interfaces are indeed available. The catch is getting software to talk to the GPIB interface drivers. There are many programs that will send arbitrary data to a virtual serial port, but not as many that can use the GPIB drives. If you're writing the software yourself, it's easy in some languages, such as Python (PyVisa works fine), but in others it might be harder. Also, I'm not sure if the drivers for the interfaces are available for anything but Windows.