Which means absolutely nothing when it comes to Windows. Ever had the computer hang and hit the reset button? Good chance you corrupted some files. Installed any new software lately? Good chance it altered some of your .dlls or drivers on its own without you knowing, possibly corrupted files also. It happens. I've also seen instances where hardware gets installed, drivers get installed, everything seems to work fine. Only it shouldnt be. A file doesnt get overwritten that should have, points to the wrong driver, everything seems ok. Then one thing changes or messes up, suddenly the offending file realizes it's pointing to the wrong place, corrects itself, and BAM! Your system doesnt work anymore. Especially Direct X, its particularly bad about that. People trust Microsoft far too much to do all the work for them even after being burned several times.