Summary
Driver for IQ4 back or iX series camera under device manager is listed with exclamation mark "!" and the camera back cannot connect to the PC USB port. It's not possible to connect the back as this appears to be unknown. User have followed the instruction for driver install during Capture One installation but still the back is detected as an unknown device.
In-Depth
Update and reinstall the driver for the digital back/camera following the screenshots below
1. device not properly detected by Windows 7 as shown on the screenshot below
2. no driver available screenshot
3. press the update driver button seen on screenshot 2 and browse the computer for driver - screenshot below
4. Pick the driver from list as the automatic determination doesn’t work
5. Your first choice is Imaging devices
6. But you can’t see any Phase One stuff
7. So your option is to Show All Device
8. Here you can find a Phase One entry and choose the Phase One digital back/camera from the model list
9. Windows warns us not to use the driver, nevertheless we press Yes
10. Success
11. And here it is, an installed IQ 4/iX series camera on windows 7 without manipulated *.inf file