So do I read/guess right: gou double-click flasher.exe and wonder why it closes on its own?
Again flasher is a CommandLineInterface tool and you need to open a command line, a DOS box, a shell, a black text input, name it you like (windows key + r, type cmd).
Then navigate to the directory where flasher is located with command 'cd':
cd "c:/program files (x86)/maemo-flasher"
or similar
and then execute it by typing
flasher-3.5.exe

If my guess is wrong please let us know what you did (precise steps) and wwhy do you think it is not working...