When I was running Windows 7 7000 I was able to install and use MS Flightsim X OK, now running Windows 7 7100 I have been having trouble installing FSX. When it got to the end of the installation for the first time a error message came up saying: Failed to load Error #0x80040707 Description: DLLfunction call crashed: Dsetup.DirectXSetupA Setup will now terminate. Looking in the instalation dir many of the exe files were missing. Well I thought I would give it another go. This time it got a but further before I got the following message: Failed to load DLL 0x80040702 GameuxInstallHelper. Setup will now terminated. When I went into the directory I found it had installed the exe files this time, so I gave it a go and indeed it does work. But I still wonder if something might be missing and why did the installation terminate giving me the impression that it had indeed failed. Like I said before the simulator worked very well with Win7 7000. I wonder if others have had the same trouble installing FSX with Windows 7 RC 7100? my setup is: Motherboard - Gigabyte EP35-DS3R Intel Core2 Duo CPU E8400 @ 3.00GHz Graphic card - Asus EN9800GTX+ Ram - 4gig x64 based computer regards Richard Since writing the above I have looked in the Windows Control panel\ Programs& Features and found there is no mention of FSX being installed. FS2004 is there OK but not FSX. Very odd.