When I upload my sketch I get this error message:
avrdude: ser_open(): can't open device "\.\com3": the system cannot find the file specified
I tried reinstalling the IDE and the drivers. I tried looking into the preferences txt file and the COM was alright.
Also, I uploaded it successfully from another computer.
What is wrong about my PC trying to upload Arduino? And the most curious thing of all is that yesterday it was fine and it was working.