my laptop has just stopped working completely. obviously the runtime error was not a game fault and was a symptom of the immanent collapse of my PC. sorry to have bothered you and thanks very much for your time.

thanks very much for your quick reply.
this happens on all games, the full error message is:
runtime error
press ok to continue
press cancel to quit
please report what caused this error along with the information below
../../../common/win32/WindowsSoundPlayer.cpp:285 failure condition:0
(null)
when ...

as a new user i'm not sure if this has been covered before, but could find no indication that it had.
i run FOG on a laptop with Vista operating system, up until recently this worked fine but now it allows me to setup a game and as soon as i move a unit the game stops running and shows "runtime ...