Pure Virtual Function Call (Modernator look here please)

This Microsoft C+++ Runtime error I get alot now and I know alot of other people get it aswell infact this has been troubeling me for ages I even had it when I first started playing Crossfire (when it first came out English Version) but still no fix .. alot of other people have this problem aswell but you never hear any solutions, and I can't find Any fix for it and I've tried everything I can think off I did all kinds of crap Defragmentation/using Registry Booster for fixes and using Game Booster for better ping putting my Graphics on low or on high it all makes no diffrence I get Black Screen Crashes and Pure Virtual Function Call Errors like RAIN! Somebody just tell me what the hell is up with this?!?