I have some suggestions and you may check the results after each one:
- Uninstall driver from device manager and Intel® Proset, restart the system, and reinstall Intel® Proset.
- Try a different version of Intel® Proset.
- If one of the two systems works you may try exporting a new package with the Administrator tool and apply it in the other computer. You may enable PSP CAM in such package.
In case the issue persists I highly doubt is driver related. Did you check the update history or use Windows* System Restore?