Flight Simulator FSX

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I am a Flight enthusiast and do a bit of real time flying, I have come to my tether in trying to contact Microsoft Technical in an attempt to establish a point, I had such a good response from my lat posting, and I thought I might find someone who can put me right? All I want to know is because the new FSX is so complex, Can I install the new Flight Sim FSX,along with Flight Sim FS9 and Train Sim all on the same hard drive without one affecting the other, in other words will there be a conflict. Many thanks for your time Alan