Windows Vista Build 5600

I get the following error on my Vista build 5600:
“AAVM subsystem detected a RPC error”.
The FAQ for this problem lists a solution other versions of windows, how can I fix it for VISTA, thanks Mike

You can’t use the actual avast version…
Only the beta 4.7.887 (installed just from the beggining) will work.
Other versions and updates won’t work on Vista RC1.
Download here: http://forum.avast.com/index.php?topic=23424.msg193970#msg193970