For school we program an arduino with visual studio and micro visio. Since a few days ago my arduino wont run the code of the arduino. At first it didnt give any errors until i tried to upload a code with arduino ide itself. avrdude: ser_open(): can't set com-state for "\.\COM3" Or saying that the acces is denied. I confirmed that my arduino is the COM3 port. The weird part is that on another pc it works fine. On the laptop where my arduino isnt working i did a loopback test following. https://support.arduino.cc/hc/en-us/articles/360020366520. This went without a problem. I reinstalled the IDE and drivers but sadly this didnt help either. If i try a class mates his arduino it wont work either. If some one has information on how to fix this problem that would be nice. If there is some extra information needed that wont be a problem either.
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