The method is as follows:
1, presses the WIN+R key to exhale the running window, enters regedit, the carriage return enters registers the Registry Editor;
2, expand to Hkey_current_usercontrol paneldesktop, find the Logpixels key value on the right, delete it;
3, if you do not find the Logpixels key value, in the desktop blank right click, select Personalized "display, adjust the size of all items, click Application, you can find the Logpixels key value, choose to delete it;"
4, then restart the computer, or set the system background picture can be.