Just upgraded to win7, trying to boot into GECK and keep getting this message. Not even remotely sure what this vague error message means. Either way, GECK instantly closes after I acknowledge this prompt. Kind of annoying.

Did you...

* Install the Geck patch v1.5
* Install the Geck into the \Fallout folder
* Install Fallout 3 first
* Update your audio drivers to the latest version
* Have an audio card
* Have the right codecs installed (see http://www.codecguide.com/download_kl.htm if not)
* Gotten fed up with trying to get fallout stuff to work with Windows 7

Yes to all the above (especially the last one). Although, I got FO3 and GECK to run in wine in Ubuntu through virtualbox on win7.