IDE 1.8.5 errors compiling for UNO board

I've tried each IDE option ( admin install, non admin install, webEditor) and none of them work / compile successfully. Windows 10 Pro x64, UNO R3

This is what I'm getting from each installed IDE.

Arduino: 1.8.5 (Windows 10), Board: "Arduino/Genuino Uno"

C:\Users\Denis\Downloads\arduino-1.8.5\arduino-builder -dump-prefs -logger=machine -hardware C:\Users\Denis\Downloads\arduino-1.8.5\hardware -tools C:\Users\Denis\Downloads\arduino-1.8.5\tools-builder -tools C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr -built-in-libraries C:\Users\Denis\Downloads\arduino-1.8.5\libraries -libraries C:\Users\Denis\Documents\Arduino\libraries -fqbn=arduino:avr:uno -vid-pid=0X2341_0X0043 -ide-version=10805 -build-path C:\Users\Denis\AppData\Local\Temp\arduino_build_331623 -warnings=default -build-cache C:\Users\Denis\AppData\Local\Temp\arduino_cache_467406 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr -verbose C:\Users\Denis\Documents\Arduino\testing\testing.ino
C:\Users\Denis\Downloads\arduino-1.8.5\arduino-builder -compile -logger=machine -hardware C:\Users\Denis\Downloads\arduino-1.8.5\hardware -tools C:\Users\Denis\Downloads\arduino-1.8.5\tools-builder -tools C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr -built-in-libraries C:\Users\Denis\Downloads\arduino-1.8.5\libraries -libraries C:\Users\Denis\Documents\Arduino\libraries -fqbn=arduino:avr:uno -vid-pid=0X2341_0X0043 -ide-version=10805 -build-path C:\Users\Denis\AppData\Local\Temp\arduino_build_331623 -warnings=default -build-cache C:\Users\Denis\AppData\Local\Temp\arduino_cache_467406 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.arduinoOTA.path=C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr -prefs=runtime.tools.avr-gcc.path=C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr -prefs=runtime.tools.avrdude.path=C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr -verbose C:\Users\Denis\Documents\Arduino\testing\testing.ino
Using board 'uno' from platform in folder: C:\Users\Denis\Downloads\arduino-1.8.5\hardware\arduino\avr
Using core 'arduino' from platform in folder: C:\Users\Denis\Downloads\arduino-1.8.5\hardware\arduino\avr
Detecting libraries used...
"C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR   "-IC:\Users\Denis\Downloads\arduino-1.8.5\hardware\arduino\avr\cores\arduino" "-IC:\Users\Denis\Downloads\arduino-1.8.5\hardware\arduino\avr\variants\standard" "C:\Users\Denis\AppData\Local\Temp\arduino_build_331623\sketch\testing.ino.cpp" -o "nul"
Generating function prototypes...
"C:\Users\Denis\Downloads\arduino-1.8.5\hardware\tools\avr/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics  -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10805 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR   "-IC:\Users\Denis\Downloads\arduino-1.8.5\hardware\arduino\avr\cores\arduino" "-IC:\Users\Denis\Downloads\arduino-1.8.5\hardware\arduino\avr\variants\standard" "C:\Users\Denis\AppData\Local\Temp\arduino_build_331623\sketch\testing.ino.cpp" -o "C:\Users\Denis\AppData\Local\Temp\arduino_build_331623\preproc\ctags_target_for_gcc_minus_e.cpp"
open NUL: The system cannot find the file specified.
Error compiling for board Arduino/Genuino Uno.

This occurs with every example sketch and even with no code.

I've tried setting up the web editor and the plugin gets an install error with this.

I've used the same board for years successfully on other computers but this is my first time trying it on this computer. Greatly appreciate any help, I've been searching for a couple of hours and haven't found anything specific to this case.

attaching image file of error when installing web editor plugin.

Could be an antivirus program getting false positive - the compile process involves a huge number of processes getting started in rapid succession, and some antivirus programs mistake that for malicious activity and block it.

Could also be a general system level problem not specific to Arduino (ie, maybe you'd find that lots of things didn't install or work as expected due to some larger problem with the system).

You should make a separate post in the Create > Editor forum section: http://forum.arduino.cc/index.php?board=101.0 regarding your problem when installing the arduino-create-agent plugin and keep this post specifically about the problem compiling with the standard Arduino IDE.