I'm definately preferring Vista for FSX as I seem to get better performance with my setup - but when I trialled RC2 version I didn't get any CTDs - but now I've bought the full version I am ... :(I get it every 30 minutes of play or so - or if I say minimise and maximise to full screen a few times (this seems to really set-the CTD off)now PC is overclocked - but completely stable on every other program, and as I said - didn't have a problem in XP or Vista RC2.Hardware - C2Duo@3 gig, 2 gig RAM, X1900XTthanks for any help,these are the error codes:Problem signatureProblem Event Name: APPCRASHApplication Name: fsx.exeApplication Version: 10.0.60905.0Application Timestamp: 44fd0a92Fault Module Name: weather.dllFault Module Version: 10.0.60905.0Fault Module Timestamp: 44fd0f34Exception Code: c0000005Exception Offset: 000069fbOS Version: 6.0.6000.2.0.0.768.3Locale ID: 2057Additional Information 1: 85b7Additional Information 2: 3e7fac7aa8fde7cd36b380f63f2fd1e8Additional Information 3: 18d1Additional Information 4: b494b4e062e5325f15d340601b1006bcORProblem signatureProblem Event Name: APPCRASHApplication Name: fsx.exeApplication Version: 10.0.60905.0Application Timestamp: 44fd0a92Fault Module Name: weather.dllFault Module Version: 10.0.60905.0Fault Module Timestamp: 44fd0f34Exception Code: c0000005Exception Offset: 0002b106OS Version: 6.0.6000.2.0.0.768.3Locale ID: 2057Additional Information 1: d0b2Additional Information 2: 9389a23b27a407da46449e702a6a3320Additional Information 3: 82e9Additional Information 4: 16ad45dd4d20052bd1179b92db5e0849

I figure you have resolved this problem by now but "weather.dll" was the file that caused your crash. This dll was updated by SP1 and the version is now 10.0.61355.0. Hopefully when you installed SP1 this fixed your problem. Best regards,Jim