Win7 in the lower right corner of the small speaker can not adjust the sound how to do

specific description of the problem:
computer has sound, the sound is also very normal, just to adjust the size of the sound needs to be adjusted through the control panel. That is, the small speaker in the task bar in the lower right corner of the screen is grayed out, and it is not possible to directly adjust the volume through it.
2































The sound is laid down, and the big deal goes to the control panel to adjust it.
3
If you really want to solve it, you can use the following method
1: If there is a backup driver before, then restore the driver
2: delete the sound card driver, re-download and install.
3: Look at c:/windows/system32 Is there a folder "systray.exe", if you haven't copied it from the same system, if you have it, manually start this file.
The above is about the small speaker in the lower right corner of win7 can not adjust the sound how to do. In the end, I have to remind you that it will not be a problem. Many of them have not found any problems for a long time, so it will not cause any problems at all.