Nostalrius Begins - Quality wow vanilla realm (1.12)

I recently downloaded the game for the first time, extracting the .ZIP folder and installed the game the way it is meant to be installed.

However, when I start the game up, the screen flashes a few dim colours like black and very dark blue, then minimizes. It does this every time and I cannot get into the game, I tried uninstalling and reinstalling and nothing works.

Any help?

Thank you,
Shadowzeal.

Open the Config.wtf file in the WTF folder and change the gxResolution property to 800x600, save, see if it makes a difference.