I recently had a similar problem with my Dell laptop on a Zoom call,where it wouldn't detect the webcam.So I attached the webcam to a different usb port and it worked perfectly.So my suggestion is to try a different port and if that doesn't work,look in device manager and see if anything jumps out as a problem.I like Mastercam 9.1 and can understand why you still use it.My other thought is that it might not be compatible with a 64 bit system and if the checks I suggested don't yield success,you may have to find a 32 bit operating system.I remember a few years ago a man I knew bought an used AXYZ cnc of some vintage and was firmly advised not to introduce any operating system newer than 32 bit XP.The information here may help https://learn.microsoft.com/en-us/tr...-64-bit-system .Obviously,a poor usb socket connection would be the least troublesome thing to overcome.Good luck.