Hi guys ,first of all sorry for my english :) anyway ;3 days ago i format my hdd and made a clean win7 install. I installed Fsx and add-ons ( see my sig ) and programs. While installing updates , i realised there are too many c++ stuff .Both 32 bit and 64 bit version were installed. For example , c++ 2008 x86 version .17 and .4148 version were installed at the same time so i decided to remove some of them. First i removed old versions and then 32 bit versions. I knew it was risky but enough with low fps !Lucky for me my fps increased from 10-22 to 18-32 . I don't know if this will work for you guys but just let you know .ThanksEmir