The game may be damaged try to see if you can fix it if not you may have to start fresh.
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just start a new game. there will be a warning, just ignore it and it will delete the file as soon as you save in the new game.
find the file you designated to hold pokemon fire red files, each save should be numbered, right click and select delete. Done
On the title screen, press Up, Select and B together. This will permanently delete your file.
right click and click "move to trash" or "delete"
delete the game