yes this is how i have it....
someone was saying if you have it installed on another partition you can play it from there without even installing it on Windows 7.
Ok with this in mind you have 2 options....
1: copy and paste (not cut and past)
( the wow directory and all its content to lets say may documents, now un-install wow... place the wow directory back to the location of your choice, make a sortuct for the launcher or wow.exe to the desktop.... in theory it now should run
if that fails you could
2: Go to computer management and make a small partition on your C:\ drive (13 or 14GB maybe more) and make for example H:\ the then follow the steps above or reinstall WoW
this would/should then enable it to play