I installed SP1 with no problem but with SP2 no joy.
I downloaded and installed (tried to) fsx_sp2_JPN from download.microsoft.com. It went to a Temporary Folder. What followed was a window "Internet Security Warning" appeared asking if I want to run the software. When I clicked on"RUN", a "Windows Installer" box appeared with the yellow error sign and stating "Microsoft Flight Simulator Service Pack 2 followed by a small box figure and below it "Flight Simulator X followed by a series of small box-like figures. When I clicked "OK", another window showing the yellow error sign stating Microsoft Flight Simulaotr X Service Pack 2 and again followed by several small boxes. At the bottom of this window is a small window with three of those small boxes. when I clicked on that, it ended the process. Any ideas what could be causing this?