I am running FSX deluxe edition with FSX acceleration expansion pack added on, i have a few things from aerosoft installed such as Ibiza X, Manchester, then i have plane software etc. I have tried running a repair but this does not make a difference. Below is my system spec and it runs like a dream. OS Name Microsoft Windows 7 Home PremiumVersion 6.1.7601 Service Pack 1 Build 7601Other OS Description Not AvailableOS Manufacturer Microsoft CorporationSystem Manufacturer HP-PavilionSystem Model VG251AA-ABU HPE-063ukSystem Type x64-based PCProcessor Intel® Core i7 CPU 860 @ 2.80GHz, 2801 Mhz, 4 Core(s), 8 Logical Processor(s)BIOS Version/Date American Megatrends Inc. 5.05, 11/09/2009SMBIOS Version 2.6Windows Directory C:\WindowsSystem Directory C:\Windows\system32Boot Device \Device\HarddiskVolume1Locale United KingdomHardware Abstraction Layer Version = "6.1.7601.17514"User Name Owner-PC\OwnerTime Zone GMT Daylight TimeInstalled Physical Memory (RAM) 8.00 GBTotal Physical Memory 7.99 GBAvailable Physical Memory 5.71 GBTotal Virtual Memory 16.0 GBAvailable Virtual Memory 13.5 GBPage File Space 7.99 GBPage File C:\pagefile.sys