I haven't been on this thread since Friday evening...looks like there has been a lot of activity/progress since then.
Well, I don't know that you can call it progress, but activity for sure.
ingineer_74's Hardware_IDs.PNG:

So your board does not have the arduino.org VID/PID like krasnejv's board. In addition to my test with installing the drivers after installing the .org firmware on my Uno's ATmega16U2, that makes me think the .org VID/PID has nothing to do with the "A service installation section in this INF is invalid." error you both encountered.
ingineer_74's upload error:
Arduino: 1.8.9 (Windows 10), Board: "Arduino/Genuino Uno"
...
C:\Program Files (x86)\Arduino\hardware\tools\avr/bin/avrdude -CC:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf -v -patmega328p -carduino -PCOM6 -b115200 -D -Uflash:w:C:\Users\tjend\AppData\Local\Temp\arduino_build_428674/Blink.ino.hex:i
avrdude: Version 6.3-20171130
Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
Copyright (c) 2007-2014 Joerg Wunsch
System wide configuration file is "C:\Program Files (x86)\Arduino\hardware\tools\avr/etc/avrdude.conf"
Using Port : COM6
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x7f
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x7f
avrdude done. Thank you.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
ingineer_74's Windows_Device_Manager_Info.PNG:

So you do have the correct board and COM port selected (potential causes of this error).
Do you have any shield or wiring connected to your board? If so, disconnect it and try uploading to just the Uno alone.
If your Uno doesn't have one of those nifty plastic bases, make sure it's not sitting on any conductive object that could short out the contacts on the bottom of the board.
the Green and L Yellow/Amber LED stay lit when plugging in the USB cable and also when I hit the Reset button.
Does the LED marked "L" blink after you do that?