How to restore the display desktop button in the Win7 taskbar

In general, we are accustomed to directly click on the "Show desktop" button in the quick launch bar of the task bar to minimize all windows, especially when opening a lot of windows. Minimizing all open windows is even more annoying. lock. However, this "display desktop" button often disappears. In addition to pressing the shortcut key Windows+D to minimize the key, how do we restore this display desktop button?
Operation steps
1 First, open Windows7 and start running the dialog box. (can be opened by pressing Win+R shortcut)

2, then enter: regsvr32 /n /i:u shell32 command in the Open “Run” command dialog box, click “Delete” after the input is completed. ” button can be.

3. After inputting the command and clicking the click “OK” button, the dialog box that DlllInstall has successfully prompted in shelll32 will pop up.

3, after we click OK, we can see that the "Show desktop" button is back in the taskbar of windows7.