Desktop picture can not be replaced

Google translation Italian to English:
I can not change desktop background! I 10.7.3 Lion. Worked before and now it is impossible!
Using an iPhoto like "Intel", version 9.2.3!
I must add that actually the first I did not use iPhoto and wallpapers I couldchange them, you must be when I use iPhoto to download images and video from my iPhone has presented this problem.
What should I do?
It does not work "hotcorner" to activate the screen saver, that I set the system sothat when the mouse arrow in the lower sisitre go off the screen, and it works, butwhen I go in the bottom right of the screen saver will take over, but no longer works. Before it worked! I already tried to reset everything, but it does not work.
Heeeelppp!
Original message in Italian:
Non riesco più a cambiare sfondo della scrivania!!! Ho Lion 10.7.3. Prima funzionava e adesso è impossibile!!!
Uso un iPhoto del tipo "Intel", versione 9.2.3!
Devo aggiungere che effettivamente prima non usavo iPhoto e gli sfondi scrivania potevo cambiarli, è possibile che da quando uso iPhoto obbligatoriamente per scaricare immagini e video del mio iPhone si sia presentato questo problema.
Cosa bisogna fare?
Inoltre non funziona "hotcorner" per attivare il salva schermo, cioè io ho impostato il sistema in modo che quando con la freccia del mouse vado nell'angolo in basso a sisitre si spegne lo schermo, e funziona; ma quando vado nell'angolo in basso a destra dovrebbe subentrare il salvaschermo, ma non funziona più. Prima funzionava! Ho già provato a risettare tutto, ma non funziona.
Heeeelppp!
Che rabbia!

It's possible that your desktop's preferences are corrupt. Try deleting this file:
Users/"your user name"/Library/Preferences/com.apple.desktop.plist
Or try "repair permissions" in "disk utilities"

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