ya i should have added more details.So when i open the exe,theres the loading screen appears but before the loading finishes,my exe just vanish.My com is 64bit but i tried both 64 and 32 bit exe,both have the same problem :/
Here are a few ideas, just fishing in the dark really.
Some people had problems with the graphic filter used, try to updated your graphics driver. Maybe these cause a crash
The game writes data directly in the game directory, so you need to make sure that the user you use to start the program has writing access to the directory.
In the past, some RenPy games have alerted several anti virus solutions and were blocked. Make sure that your solution doesn't.
Last but not least: There is usually a file called "log.txt" in your game directory (of course only if write access was given).
If it's there, open it and see if the reason for the crash was logged.
You might also post it's content here (but PLEASE use the spoiler function).