after update background disappeared

[Guest hmh79]

the update thing popped up on my computer so i restarted the computer to

update it. everything went as usual, but once the computer was completely

back on, my background on my desktop had disappeared. my screensaver is

still the same and everything else still is just my desktop. when i go to try

to change it, nothings highlighted like i can use it. i can't browse, pick

from the list or change the position. all i can do is change the color. my

original background flashes everytime i turn my computer off. please help i

want my background back.