HI All I am having a nasty time with this "REFERENCE_BY_POINTER" STOP error during shutdown in vista. It happens just before the machine actually powers off. From what I have read it is linked to driver issues, I have tried various things ie: MSCONFIG disable all / removing unsigned drivers etc but it wont go away and I figure the only thing that will help is understanding the minidump but I just cant figure out what they mean. So I have uploaded it for anyone interested to look at and offer their comments. Many thanks in advance..