Hello,
when i load wow my screen goes to a purple screen
Welcome to the forums.
I'm not an expert, & pretty new here myself, but it could be your card, do any other games do this or act up in general, or just WoW?
My basic advise would be to make sure all your drivers are up to date, check your connections, & this is going to sound stupid, but I have to ask. Have you restarted?
If all that doesn't work, no other games are acting up & it turns out isn't your GPU, you may have to reinstall WoW.
I hope any of that helps, though some of the more experienced persons on this board may have a better answer for you.