I have a few Vista Buisness x64 machines and none of them are able to download updates. I have one machine where 20 updates are failing. All of the XP machines work fine and I'm able to surf the web. Any ideas?
Have any errors or logs come up on your firewall. I take it you are running a network. When you say you can surf the web, do you mean on the Vista machines? Have you got any other networking problems, can the machines see each other? Try going into dos and pinging the update server, this will tell us if your machine is talking to the update server.