This site is being deprecated.
Please see the official X‑Plane Support page for help.
You can try running X-Plane in compatibility mode (Windows XP or Vista). You can read more in "Make older programs compatible with this version of Windows" here.
I installed X-Plane 8 (demo) on Vista and it runs without comaptybility mode. You can also check system requirements and/or your graphics card drivers.
Some more tech info you can find in log.txt file. The log file is generated automatically and contains diagnostics about your graphics hardware, installation, and any error conditions.You can also contact tech support or file a bug here.
This site is no longer being actively maintained.