Please try restoring the KitProg firmware by following the steps provided in section 22.214.171.124 Restore PSoC 5LP Factory Program Using Bootloader Host Tool of the KitProg User Guide and see if that resolves the problem.
If you still see the issue, try connecting the Dongle to another USB port or another PC and see whether the kit is enumerates correctly.
Also, make sure you have installed the latest kit software on you PC before connecting the kit.
Meanwhile, you can try restarting your PC and then run the Microsoft's USB Device troubleshooter once to detect any issue with USB devices.
Please try restoring the PSoC 5LP firmware by following the steps provided in section 3.3.4 Programming PSoC 5LP on the CySmart USB Dongle of the CY5672 Kit Guide. Make sure you use the firmware available in the latest kit software. That should solve the problem.
Also confirm whether or not the kit enumerates successfully on other PCs (after firmware update). That makes it clear where the problem lies.
Looks like you are trying mix and match of drivers. When you updated/restored the Dongle firmware by following section 3.3.4 Programming PSoC 5LP on the CySmart USB Dongle of the CY5672 Kit Guide, you need to install kit drivers available in the CY5672 installation directory from path shown in the below image, not the KitProg driver from PSoC Programmer directory.
So now uninstall the USB-UART driver and select 'Delete the driver software for this device' option while uninstalling, shown in the below image.
Then reinstall the driver from kit installation directory shown above. That should resolve the issue.
If you still see the issue, you should run some USB device troubleshooter or cleanup utility to fix your PC.