fscrew38.gau error

Once again,for no explicable reason,flying an LDS767-300ER,cruisng at FL370,with LNAV and VNAV engaged,the aircraft goes overspeed all of a sudden,and FS9 crashes due to overstress.When trying to re-start at a saved flight,I get an fscrew38.gau error.I have no idea what it is and the FS2Crew Forums have not been of much help either.Therefore,anyone with any idea what this error is,or how to resolve it,because I'm within a hairsbreath of slinging the whole FS9 software and et al into the bin,as I am so fed-up with buggy software!But I'm putting my trust in someone far more knowledgeable than I being able to keep my interest in this hobby alive much longer.RICK