Different Album art in Media Center than Media Player

I have two computers set up through a home wireless network. I am using
separate copies of the Windows Media Center with Windows Vista on each
computer. I have cleaned up all of the album art on the main computer. All
of my changes appear in the Windows Media Center on the main computer and in
the Windows Media Players on both the main and networked computers. For some
reason, all of the changes do not appear in the Windows Media Center on the
networked computer. When I disconnect the network, the incorrect album art
remains in the Windows Media Center of the networked computer.

Is there any way to delete all of the incorrect album art on the networked
computer and to replace this incorrect art with the correct information?