Please post the full text of the error message. Use the button to copy the error message, and post it using code tags (the </> button in upper right when making a post). Without these errors we couldn't fathom a guess at what the problem is. Whenever you ask for assistance with any technical problem, you should always post the full text of any and all error message. Error messages contain valuable information, even if you don't know what it means, someone here will.
You also forgot to tell us which Arduino you have, or if real a clone?
So NOT an Arduino then. It's an UNO r3 compatible. Could you tell us what chip it has next to the USB port, and/or a link to the manufacturers web site (Where the drivers are likely to be).
Did you restart your computer after the install?Also, do you have anything plugged into the UNO, other than the USB?