Win7 system open file prompt "references an unavailable location" solution

The specific method is as follows:
1, press the win+R shortcut key on the keyboard at the same time to open the computer's running window;
2. In the open running window, type regedit and click Enter;
3. In the open registry editor window, click to expand HKEY_CURRENT_USER\\SOFTWARE\\MICROSOFT\\WINDOWS\\CURRENTVERSION\\ in the left menu. EXPLORER\\USER SHELL FOLDERS;
4. In the right window, find the “My Documents” option, double-click the specific setting item one by one, pop up the modification window, and set the path to the drive letter you want to place. Click “OK”.
5, after the modification is completed, close the registry editor, and then restart the Win7 system, and then open the folder to be opened before it will be normal.