arduino doesnt upload

so i cant upload any sketches, even the blank one, but the reset button works, blinks 3 times, and 5 volts/ 3.3 volts pins work. attached to com3. please advise.

What board?

Original or clone (eBay/Amazone/AliExpress/China)

Installed the drivers?

What is the symptom that tells you that you can't upload?