Clean install of FSX and FSX Accelerate on C:Flight Simulator/Microsoft Flight Simulator X. And this on a clean install of Windows Vista.I bought both packages, I have no problems with the base package (737-800/900). But when I try to install the expansion package (737-600/700) I get the "unable to locate fsx.exe, unable to install" message. I tried the registery tool, but that doesn't do the trick for me.