Hi my flight simulator 2004 wont boot up on my Windows 10 help
Did it ever?
If not then I would uninstall it, clean it out and reinstall.
This is a uninstaller that many members have used.
https://www.revouninstaller.com/revo-uninstaller-free-download/
There are hidden files and folders and registry lines that have to be cleaned out, this will do it.
Let us know what you decide.