errors on upload to arduino?!

Development Tools IDE 1.x
1

when i try to upload i get this error (windows 10 N)
Arduino: 1.6.8 Hourly Build 2015/12/30 06:43 (Windows 10), Board: "Arduino/Genuino Uno"

Sketch uses 6,566 bytes (20%) of program storage space. Maximum is 32,256 bytes.
Global variables use 335 bytes (16%) of dynamic memory, leaving 1,713 bytes for local variables. Maximum is 2,048 bytes.
avrdude: ser_open(): can't open device "\.\COM4": Access is denied.

Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0xe8
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0xe8
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.

2

Try the Loopback Test. Check your drivers for the USB/Serial chip in Device Manager.

3

looks like it

yep.PNG

4

Does the Loopback Test work? I suppose it might not if you can't select Tools: Serial Port:COM4 in the IDE to start.

5

when i click that it just closes the tools menu, but could it possibly be that my project uses a 20 x 4 lcd ? would the serial communication interrupt the computer? for example if i unplug the usb to the arduino and then plug it back in it will let me upload