Modern sims solve most problems automatically. FSX did not. If you are still flying FSX: Steam Edition (which remains popular on low-end hardware), you will encounter errors like "Scenery.cfg is corrupt" or "Unable to load gauge." The official Microsoft support articles are gone. However, an FSX Blogspot post from 2011 will walk you through manually deleting terrain cache in ways no modern tutorial bothers to document.
: Always run an antivirus scan on .exe or .zip files from older blogs. fsx blogspot