Nah. The default identity of the network for Vista is "workgroup". Go in to control panel and get it named the SAME as the network that your other computers name. Then you'll find it.
Dr. Bruce, you're right about having to use the same workgroup name, but that's only one part of it. Vista networking isn't brain surgery, but it's more involved than setting up a P2P network in previous versions of Windows.
If you don't reconfigure the Network Location Type and share permissions, folders that you designate as "shared" will not be accessible over the network except to authenticated users who have accounts on the host computer.
One way to bypass a lot of the annoyance is to stash the stuff that you want to share in the
"Public" directory, configure only that folder for network sharing, and then create subfolders for each user's stuff within that one folder. Network sharing of the Public directory is disabled by default, which is sort of counterintuitive, but at least by storing everything to be shared in that one folder, you only have to go through the configuration once.
But what I'm moving toward more and more these days is just using RAIDed NAS for home network storage. RAIDed enclosures are getting so cheap these days that they're well within the reach of most families; the RAID mirroring provides a measure of redundancy; and because most of them run on Samba on embedded Linux, the NAS itself is pretty much immune to malware. So even when the users trash their computers with viruses and spyware, the stored data usually remains safe.
Rich