Hi,
I installed Arduino 1.8.1 under Windows 10. I have some problems. I got "total control" but I had the following message :
C:\Program Files\Arduino\hardware\tools\avr/bin/avr-ar : unable to rename 'core\core.a'; reason : Permission denied
I had also, instead of "Permission denied", "File exists". I had to say I have no problem when I am "great aministrator".
Does someone have an idea about that ?
Best regards