From @PFKlammer:
Joulescope should not have VID/PID collision. It is a unique VID/PID assigned by MCS Electronics which they can legally do since their agreement with USB-IF predates the no resale clause.
I do not know why the HP Printer driver is incorrectly claiming Joulescope. Either way, you should be able to follow these instructions to force Win 7 to correctly associate Joulescope with the WinUSB driver.