Method 1 Press the Windows key+R (probably the second button in the bottom left row of the keyboard, or the win icon) to open the "Run" dialog box: enter regedit, enter or OK.
 As shown in the figure, right click "EnableLUA" and select "Modify".Change the value to "0", other settings need not be modified, and then confirm to restart the computer if it is convenient (if it is not convenient, restart the computer, and log off to re-enter the desktop without restarting).
This should be the problem of setting the mouse in the system. You can try to find the mouse item in the control menu in the start menu to enter the setting. If you can't click the mouse, you can press CTRL while pressing ESC, and then use the up, down, left and right keys to enter the setting menu. After entering the setting menu, you can use TAB key together with the direction key and ENTER key to select.
Your computer aunt is here -- In fact, I want to ask you, what do you choose in the desktop box?What's the usage? If it is used to box select several files to transfer, copy, cut, paste, delete, etc., click a file, press and hold ctrl, and then left click the second file
