Crash to Desktop(CTD's) HELP!!!

I have currently been experience crashes to desktop with my add-on laden FS9. I have done all the normal things I can think of like virus scans, adware scans, memtest's, etc.The odd thing about these occurances are that they only happen in certain spots of the world. Two such places I have identified are:A. Imaginesim KCVG....I go about my normal pretrip and enter everything into the FMS, do my preflight and as I am getting pushed off the gate and turning my packs off to start the engines the screen disappears to the desktop.B. Another instance the VOR PAM in northern Netherlands(I believe). Say I am flying Aerosoft EGLL to either Dusseldorf or Hamburg where you usually overfly the PAM VOR, I will enter most everything into the FMS however when I get to that waypoint(PAM VOR) I will enter it and immediately I lose the screen to the desktop.If I come across any other instances I will add to the post. Anyones advise or help would be greatly appreicated!