Desktop:wallpaper restore: big problems

i’m having really bad problems these days. i haven’t changed my wallpaper in months, and after i was affected by a virus, i had to go in registry and change the values.

can anyone please help me restore all the stuff? i tried some stuff, and now it shows a white active desktop sort of thing on my primary monitor, and a perfect image on the other one. also if i right click on desktop, goto properties and to desktop, everything is disabled. i was able to get that to work once, but now it doesn’t work. also i can’t make the positions work at all: tile, center, stretch stuff. please help me.
thanks. =)