PlacaFromHell:
Are you talking about upload a sample program?
I'm talking about trying to upload any program to your Pro Micro using the Arduino IDE, not Arduino Builder. If the upload is successful with the Arduino IDE then you know the problem is related to Arduino Builder. I'm have no experience with Arduino Builder and likely the same will be true for most other people on this forum.
Do this:
- If you haven't already, download and install the Arduino IDE from http://www.arduino.cc/en/Main/Software.
- Start the Arduino IDE.
- File > New
- Tools > Board > Arduino/Genuino Micro
- Tools > Port > COM4 (or whatever port your Pro Micro is on)
- Sketch > Upload
After that, please report your results here.