i had previously posted about my 757 on windows 7 for fsx crashes my sim when selecting it on the "choose aircraft" page. I was told to diabale anti-virus as already stated i had disbaled antivirus when i first downlaoded it. The origonal issue was when i first downloaded it, it was fine but after selecting it a few times, there was problems and started to reinstall it often this began quite normal unitl today where it doesnt work at all. I orginally installed it with any 3rd party anti virus of. Worked fine but you told me to do it without windows defender so i ddisbaled that and i still have the same problem but i downloaded the 727 in down situations and it works fine, i never beleived the problem was anti virus because other products work fine. I said previously that it could be an issue with maybe how it downalaods the fact that it fails the download a few times, this may be casuing an incomplete file. Well like i said no problem with the 727. But i was able to downaload the 757 using my  4g with no issues. But never the less same problem. So yet again im stuffed no idea whats happening the only time i manamnged to get it working was by selecting the 757 in the sim rather on fsx main page but this worked once tried it again and just crashed the entire thing out.