How to prevent sort of beep sound when..

When I presse Alt + F4 to close main dlg running,
the Windows gives me like beep sound(it sounds like error sound I guess)

give me a hint. Thanks.
In this case you'll need to modify the regedit. And the exact key and value, use Google :)
In case it happens with all programs, it's a configuration fault.
In case it only happens with yours, you are failing at destructing the window or the data in the right way. So, post some code and we'll see if there's something that can be done.
Thanks all.
I should post some code so that the problem will be found.
I will post it again. Thanks.
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