I'm having problems trying to change my wallpaper. I chose a photo then select external tools followed by set as wallpaper only to get the message box which says Sorry - GWENVIEW- Could not find program "set".
A similar thing is happening when i try to open i-tunes with wine. I'm getting the message box telling me Sorry File manager- could not find the program '/home/user/my'

I'm not too sure what version of linux that I'm using, all i know is that I've got the new eeepc 901 if that helps.

Any advice would be much apreciated but please remember that I'm a complete beginer with computers. Thanks for your time.

I think you're using Xandros Linux, with a few special tweaks. The best place to go for help is

http://forum.eeeuser.com

To install new wallpaper, place it in /usr/share/wallpapers. Then you can right-click on the desktop and use the "properties" dialogue to select it. I'm afraid I can't help with i-tunes, though.