Some of the others have already mentioned some of these keys, however, you will want to look at them all and see which ones apply to your hijack. I've see at least a couple different desktop hijacks in the past few weeks.
Navigate to the following key:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop
Look for a DWORD value called "NoChangingWallPaper"
When located right click and delete it!
In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
you should NOT have the following VALUES, RIGHTCLICK AND DELETE THEM...
NoActiveDesktop
ForceActiveDesktopOn
And for the following ActiveDesktop KEY:
HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\ActiveDesktop
There should only be the (default) string here, right click and delete all of these entries. Remove everything but the (default) string. not the following:
NoComponents
NoAddingComponents
NoDeletingComponents
NoEditingComponents
NoHTMLWallpaper
If you still have problems, after this, we will have to start you from the beginning of this hijack removal.
