Computer does not recognize Galaxy S4 after upgrade from Windows 7 to Windows 10 I have updated from Windows 7 to Windows 10 and now can't get my Galaxy S4 to connect via USB to my computer to download photos etc.

I have Kies ordinary and lite, both up-to-date, but still nothing. The computer says to put the phone into MTP mode, but that is nowhere to be found. Please advise.
Connect your galaxy S4 to the PC first (don't bother if not recognized).
Go the the Device Manager (Right click on ‘My Computer’ and select ‘properties’ then ‘Device Manager’  in the left sidebar, or go to ‘Control Panel’ then ‘system’ then ‘Device Manager’ from the left sidebar).

Next, find the Android device driver if found then right click uninstall. The driver may be listed under ‘Portable Devices’ or ‘Other devices’ or it may be listed under it’s own name.

Once the drivers are uninstalled, unplug your device from the PC. Make sure your computer is connected to the Internet and automatic updating is turned on, then replug your device and allow Windows to find and install the drivers all over again.
If your device is not listed in the drivers list then check whether you are using the Right cable ( cable with data transmission capability not just charging).
Provide the unlock password on your device in order to view external or internal memory on your PC. 
In windows 10, go to setings->Devices->AutoPlay. Tap to choose what happens to the devices after connected.




Alternative or best solution

Move to AirDroid for transferring contents from your system wirelessly to your phone or vice versa.