If you are staring at the "Paul.dll is missing" error right now, take a deep breath. The problem is not your PC. You have not broken anything. By following the five fixes above—particularly the GFWL reinstall or the XLiveLess patch—you will be exploring Albion, pulling off heroic poses, and breaking every window in Brightwall Village within the hour.
as a "false positive" due to its intrusive DRM behavior, quarantining it and preventing the game from running. Ordinal 42 Error Paul.dll Fable 3