XPS M1330 - Battle Results
After all the struggling, my final solution is to have Vista on one 50GB partition and Linux on the rest. No damn MediaDirect bloatware anymore.
My home key now boots into windows and my normal powerkey into GRUB and linux. Just perfect :).
Huge thanks to “Mario666” for his howto on notebookreview forums.
Just remember to run the command line in Vista as Administrator (right click the icon in the start menu). Otherwise the rmbr.exe command will just throw a useless error.