Does not let me change my desktop background

hello,

so i could change my desktop background before, i used to have the windows 7 ones, the different sceneries around the wolrd one, that changes ever so often, but then it decided to stop changing and got stuck on one. When i tried to change it, it told me that one or more features has been disabled by system admin, which is me! i read other threads and it said to go to accessories and right click on command prompt on run as admin, which i did but it made no difference. Can anyone help me on this? the only way i can change my background is by o0pening a picture with adobe photo viewer and then setting it as desktop background but once i restart my computer it changes back to the old one. If anyone has any ideas, let me know!

thank you!

hey, i tried the first option and it didnt work. As for the second option, i have home premium addition so it says i dont have the group policy editor, so i cant do that one. Any other ideas?
thanks for your help!

I opened the second one but i have the home edition and it told me i couldnt use the group policy thing. thanx!

it worked! i didnt restart, i thought id just try it, and it changed! thanks a lot =)