[증상]
On a computer that is running Windows 7, some function keys and keyboard shortcuts do not work correctly. Every time that you press a function key or keyboard shortcut, the corresponding function is triggered two times.
For example, assume that your computer keyboard has a built-in Calc key that lets you start Calculator. When you press the Calc key, two instances of Calculator start. Or, assume that you have a Mute key on the keyboard. When you press the Mute key or the Fn+F6 keyboard shortcut to mute or unmute the system sound, the sound is not muted or unmuted.
Notes
This problem is a timing related issue. Therefore, the chances of the problem occurring can be influenced by different factors. Observed examples that increased the chances of the problem occurring include the following:
- On a localized version of Windows that has a language bar, you dock the language bar in the taskbar.
- On a computer that has a hyper-threading CPU, you disable the hyper-threading in the BIOS.
- You attach a new hardware and install the respective drivers on the computer.
[원인]
This problem occurs because of an error in certain hook logic in Windows Explorer of Windows 7. This error causes Windows 7 to send two commands every time that you press a function key or keyboard shortcut. In the mute example that is described in the “Symptoms” section, Windows 7 sends two commands to the sound mixer for each mute or unmute request. Therefore, for the mute and unmute operations, the second command undoes the operation of the first command. This behavior makes it appear that the mute or unmute function does not work.
Windows6.1-KB975741-x86.msu
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