I've been just about everywhere on the web seeking answers to this problem, so I'm hoping Slyck's guru's will finally be able to help out

I have a brand new PC attached to a Linksys WAG354G gateway running Vista Home Premium. I also have an Archos 604 wifi which has a setting that provides for a file server.
I have dreams of wirelessly searching my PC from the archos while I'm in bed or around the house, and playing back media, but, despite what others are telling me they can do, I'm no nearer to being able to set it up.
The Archos connects to my home internet connection wirelessly - I had to input my WPA passkey to enable it to do so, but now I can happily browse the internet. However, when it connects, even if I turn the file server on on the Archos, the device just will not appear in my Network.
I have no idea how to add devices to my network, but everything I try that Windows help suggests or other forums suggest just won't work for me.
My internet connection is provided by Zen in the UK, if that helps anyone to provide a solution. I'm going absolutely spare trying to set this up and anyone able to solve this would gain a huge friend!

Seriously, anything anyone can suggest would be great.