I'm trying to install my Arduino Uno. I've followed all the instructions on the site. I mistakenly downloaded the .zip file and didn't unzip it then plugged my uno in. So naturally no message came up. I then proceeded to follow the correct procedure and the windows driver does not pick it up. What can I do to fix this?

I'm trying to program my Arduino Uno with my Windows PC. I followed all the instructions on the site. I mistakenly downloaded the .zip file and didn't unzip it, before plugging in my Arduino Uno. So naturally, no message came up. I then followed the correct procedure, but Windows driver installer does not detect the Arduino Uno. What can I do to fix this?