I hope Kendall won't mind if I throw another tech question into this thread. A friend's desktop (windows XP, I think) has been 'locked' by someone more 'techy' than he (and unavailable to restore it). When you rightclick on the desktop, or open the display controls, all options for changing the desktop (using wallpaper, using themes, browse, customise, tile, etc.) are greyed out.

The reason given for doing this was 'waste of memory', which is silly - it's a forty gig computer with not much more than Windows on it. Any suggestions? I looked everywhere I could think of for an option to restore the functions, but no luck.