Well, its really at your discretion. If you use Program files, you may have UAC issues. I (and I think most here) have created a separate folder just for sim tools. I have a pretty good organization system going to make it easy to locate and keep things neat. I just dont want to uninstall 4 or 5 programs to move them so they are still in program files set to run as admin when used so the UAC doesnt conflict or restrict.