What can I do if the win7 system cannot change the screen saver?

What should I do if the win7 system cannot change the screen saver?

1. Click on the start menu on the desktop, then click on the “ghost win7” menu to enter “Run”, you can open the running program;

2, in the running program Enter gpedit.msc to open the local Group Policy Editor. In the left column, expand “User Configuration”-“Administrative Template”-“Control Panel”-“Personalization 

3, then on the right side of win7 personalized In the window, it is found that "block the screen saver", win7 double-click to open the edit window, and in the edit window, modify it to "ld"; not configured “ or "disabled" ; Then click on the bottom of the OK and Apply button to complete.