How to play WoW without the Bnet Launcher ?

[MiRai]

So, how can I launch/play wow then, if I uninstall the bnet app ?

Not that I know of, but if your computer is freezing then it's usually the same as a "bluescreen" (even if it's not bringing up a blue screen), and when you restart your computer you should be presented with a message box stating the "Windows has recovered from an unexpected shutdown." In that box it states the problem and gives a BCCode below which is the code that you would then throw into Google to search for a possible fix.

Freezing/Bluescreens usually mean that either a driver or your hardware is acting up or failing.