On Windows XP and using Arduino 1.6.0, trying to upload anything to Arduino uno, I'm getting this error: avrdude: ser_open(): can't open device "\\.\COM3": The process cannot access the file because it is being used by another process.
I have the board set to Arduino uno, the port to COM3 (the only one) and the programmer to Arduino as ISP. Infact, no matter what programmer I choose, I keep getting that error.
I'm pretty sure I programmed to very same board a few years ago, but don't remember exactly how, or even if it was using the same version or another (I got also 1.5.8).
Complete message:
Using Port : COM3
Using Programmer : arduino
Overriding Baud Rate : 115200
avrdude: ser_open(): can't open device "\\.\COM3": The process cannot access the file because it is being used by another process.
avrdude done. Thank you.
Problem uploading to board. See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.