Win7 can't change the resolution of desktop background image

Symptom:
Windows 7 desktop background can not be changed suddenly.
Cause analysis:
Virus or third-party optimization, or the installation of theme software, etc. may cause such problems.
Solution:
General method: kill the virus, disable all startup items, this need to try before the invalid is in the following operation.
Method 1:
Enter the Easy Access Center in the Start Search box and press Enter;

Pull the slider to “Browse all settings”. Click “ Make the computer easier to view 

View the bottom of the window<quo; Make the content displayed on the screen easier to view>Part<;Delete background image (if any)” is checked Select? If yes, please clear the check;

Check if the wallpaper can be changed.
Method 2:
If the Windows 7 desktop background is locked, you will not be able to change the background of the desktop, as long as you are in the group policy, "Block changes to the desktop background" and "Desktop wallpaper" For “not configured”
Group Policy&##############################################################################################################################
If the system version does not support the Group Policy Editor, you can try to modify it directly from the registry, as follows:
Use the key combination <;Win+R” call up the run 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)
Hint: Modifying the registry is risky, please be careful.

Locate the following registry key in order:
HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionPolicies
find the ActiveDesktop entry. (If not, right click on “Policies”, select “New” and click “ActiveDesktop”.

Click to expand ActiveDesktop, right click on the right detail window and select “New” -> DWORD value & rdquo;, named NoChangingWallPaper;

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

Click “OK>Save changes and exit the Registry Editor.
Restart the computer, can the wallpaper be changed now?
Method 3:
If it doesn't work, look at the TranscodedWallpaper.jpg file, maybe it's a problem.
Enter the following address in the address bar and press Enter.
%USERPROFILE%AppDataRoamingMicrosoftWindowsThemes
Rename TranscodedWallpaper.jpg to TranscodedWallpaper.old. (If the file suffix name is not visible, click “Alt+T” bring up the toolbar, open the “Tools->Folder Options”, uncheck the “ on the “View” tab to hide Know the extension of the file & rdquo;.)

The following prompt will appear, skip it directly, click “ is & rdquo;;

Then, double-click to open slideshow.ini, clear all files Content;

Exit the resource manager. Restart the machine, check it out, is the problem solved?
If it still can't be solved, all the options for the background settings have been changed, only system problems can be considered.