do you have Windows 10? Have you looked at the Windows components to see if DirectPlay is enabled? It does almost sound like something else though... you could look in "X:\Users\UserName\AppData\Local\Temp" (a hidden folder) and see if you see leftover S3Ditor install files... The "X" stands for whatever drive you have your Users folders, UserName is whatever your UserName is, and to "unhide" system folders, you would use "Folder Options", the "View" tab, and tick the "Show hidden files, folders, and drives" radio button. That is also a long-shot though...
