Nostalrius Begins - Quality wow vanilla realm (1.12)

http://failiem.lv/g/msjhwvi#aa/memory.png
So i get this error now and then. My computer has never done this before
I have tried to log into different servers and nothing like this happens. Can anyone help me? It sometimes annoys me.
I have also tried to reinstall my laptop and have all new drivers for everything. No other game does this.
Also someone said it's because of addons, but even without them i have this alert.

Turn off running background programs.

Increase pagefile size.

You can use Google to learn how to do these things.