I have been having numerous CTD problems with FSX over several months for no apparent reason. When I have searched under Vista's Problem History it tells me that in nearly all cases the problem was caused by the ai_player.dll module. I have done a search on numerous forums and Microsoft with no solution. The CTD does not happen all the time. It is at random which is even more confusing as I cannot link it to any particular addon aircraft or scenery.Any ideas?My system is:Intel E6600 Dual Core 2.40 GHz ProcessorIntel 975X Motherboard4 GB Corsair DDR2 RamNvidia 8800GT 512 MB Graphics CardCreative SB Audidgy 2 ZS SoundcardWindows Vista 64 bit SP1FSX SP2 AccelerationTraffic Xand various addon aircraft and scenery.Any help would be appreciated.Thanks.Dave.