I suggest to not log in during the test.
1. Make a backup of T-Engine folder from C:/Users/Username/.
2. Start t-engine.exe normally. Change something in options and start a new game. Save the game and quit to desktop.
3. Start t-engine.exe normally. Do changes in options remain? Does Load Game menu contain a test character? Can you load that character? Quit to desktop.
4. In explorer open C:/Games/t-engine4/. Is there T-Engine folder? Is it empty?
- a. If there is T-Engine folder. Rename it to T-Engine_old and repeat step 2. Does the game create T-Engine in C:/Games/t-engine4/?
- a. If the game creates T-Engine folder in C:\Games\t-engine4\. Delete T-Engine folder in C:/Games/t-engine4/. Copy T-Engine from C:/Users/Username/ to C:/Games/t-engine4/. Start t-engine.exe normally. Select Load Game and try to load a game.