I solved it by duplicating the world of warcraft-folder.

now i have

c:\wow1\
c:\wow2\ etc.

you can choose the executable in the keyclone-setup > command editor.

downside is that u have to keep update 5 wow-folders.
beside you are able to setup different graphics settings through the interface panel directly in wow, if u have different folders, at least in my case, the system no longer crashes.