I wanted to do the testing, so I downloaded all the stuff. I ran the patch after installing everything... now, whenever I run launcher, or even Wow.exe (all the PTR versions), it just crashes, giving me an error

"Wow.exe - Application Error

The application failed to initialize properly (0xc0000005). Click on OK to terminate the application"

Any ideas on what to do?

I'm running XP, with all the latest service packs and such.