R6025 runtime error

Has any one else had this 'pure virtual function call' error lately. I have had it before and fixed it after many google searches, something to do with registry entry errors, can't remember the link i used to find a cure. I ask this now as the #### problem has returned and i can't get rid of it, I know it's c++ related or file that has got on my harddrive and I've tried all the usual things that i can remember but with no luck. It can happen any time while i'm simming sometimes 10 minutes or much longer and any scenery or a/c, reinstalled a fresh working fs9.exe file but always pops up and sends me to desktop. If anyone can help i would be greatful. peter.