Nostalrius Begins - Quality wow vanilla realm (1.12)

I've been having this problem for about a week where some character portraits would look like a total pixelated mess. Today I decided to make a screenshot of the problem and I found an even bigger problem.

http://i.imgur.com/KWnGqZH.jpg

The screenshots I would take would all turn out like this, just like the portraits. What's going on with this?

For starters, try updating your graphics card drivers. Ensure you're running the most current driver.

If that doesn't work, try running WoW as an administrator. If that doesn't work, if you installed WoW to the C:\Program Files (x86) folder, cut and paste the WoW Classic folder out of the Program FIles folder directly onto C:\ so it's running from C:\World of Warcraft Classic. If that doesn't work, try a full scale uninstall, delete any remaining loose files, and reinstall WoW again.

Managed to fix it. Turns out that it was the latest nvidia drivers that screwed everyone up. Clocked back to the previous version and everything's working fine.