Was this working for you and stopped, or is this something new you are putting
together?
You have one 256MB RIMM installed? Do you know that both memory sockets have
to be filled. If you only have one RIMM installed, the second socket needs a
CRIMM (Continuity RIMM) installed.
Check the VC820 support page for more information:
http://support.intel.com/support/motherboards/desktop/VC820/