Win7 desktop background can not be replaced solution

If you're troubleshooting viruses and setting up problems, try the following:

Method 1: Optimize the video display

1.) Go to the desktop and start the search box from the bottom left corner of the desktop. Enter "Easy Access Center" as shown below:
Enter Easy Access Center

2.) As shown above, enter the Easy Access Center in the Start box and press “Enter] to confirm and enter the browse. All settings control panel, find “ browse all settings & rdquo;, then click “ make the computer easier to view & rdquo; as shown below:
enter to make the computer easier to view

3.) then we look at the bottom of the window “ Make the content displayed on the screen easier to view & rdquo; part & ldquo; delete background image & rdquo; option is checked? If so, please remove it, then click the confirmation at the bottom, as shown below:
will delete the background image & rdquo; remove the front hook

After completing the above operation, then try to replace the desktop background, generally come If you can still solve the problem, if the problem persists, you can try the following methods:

Two: Check the registry for problems

Use the key combination "Win+R" to bring up the operation. Command box. Type regedit.exe and press Enter to open the Registry Editor. (If the User Account Control window pops up, please allow to continue)
Enter Registry

to navigate to the following registry key:

HKEY_LOCAL_MACHINE\\\\Software\\\\Microsoft\\\\Windows\\\\CurrentVersion\\ \\Policies

Locate the ActiveDesktop entry. (If not, right click on “Policies”, select “New->Item", and name it ActiveDesktop)
Find ActiveDesktop item in the registry

Click to expand ActiveDesktop, right in the right detail window Mouse, select “New->DWORD Value", name it NoChangingWallPaper.

Assign a value to the new value NoChangingWallPaper. 1 means to prevent changes, 0 means to allow changes. Here, we assign it a value of 0.
New Value NoChangingWallPaper

Click “OK Save changes and exit the Registry Editor to restart your computer. If the problem persists, the system may have serious problems. I suggest you reinstall the system or like to restore it. Now there are many ways to reinstall the system, and it is relatively simple