I tried to download a freeware scenery two days ago, and followed the instructions to the key, and the scenery still wouldn't show up. Somehow in my efforts to make it work I accidentally overwrote the default scenery files. It almost always asks my permission before overwriting a file but didn't for some reason this time. I then repaired FSX via the CDs, and it said repair was completed, but not only are the scenery files still overwritten, now FSX won't start. It shows the splash screen for a few seconds and then disappears.