Lion, system preferences freeze when I tried to change wall paper,how do I fix this?

lion, system preferences freezes when I tried to change wall paper,how do I fix this?

Quit System Preferences if it's running. In the Finder, hold down the option key and select
Go ▹ Library
from the menu bar. From the Library folder, delete the following item, if it exists: 
Caches/com.apple.systempreferences
and move the following item to the Desktop:
Preferences/com.apple.desktop.plist
Launch System Preferences and test. If you still have the issue, put the item on the Desktop back where it came from and post again. Otherwise, delete the item.

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