Are you installing Photoshop CS6 from a disc or did you purchase a download? Which operating system are you using? We do have Errors "Exit Code: 6," "Exit Code: 7" | CS5, CS5.5 - http://helpx.adobe.com/creative-suite/kb/errors-exit-code-6-exit.html but Exit Code 6 by itself is a bit generic. If you can provide the additional requested details it would be appreciated.
Adobe support told me it meant I did not have adequate graphics card - so I pitched the printout of the error summary. I can redo install if necessary to recover complete error summary
