http://technet.microsoft.com/en-us/l.../bb727037.aspx

Have a read of the above; it should help.

Make sure the 2 computers have the same workgroup name.
Start-computer-right click-properties-computer name-etc. WORKGROUP
I assume that you can connect the Vista to your wireless network by Start>
Connect to> Follow prompts, including WEP or WPA.

In Vista Network and Sharing
Network Discovery:ON
File Sharing:ON
Public Folder Sharing:ON (This is the old XPs shared Docs)
Password Protected:OFF

You will have to sort out the sharing in XP as well.

"Edo" wrote:

> Hi all,
>
> I have a problem related to ad hoc networks. I have a router connected to a
> modem which is connected to Internet. The router is conencted wirlessly to my
> home pc with windows xp (I know this is a vista newsgroup). I've always used
> the router just to connect to the internet, but now I've bought a vista
> notebook and I need to share the folders on my desktop (w xp) with my laptop
> (vista). I wanted to create an ad hoc network but it seems to be impossible.
> No way to get the two computers connected. It must be a problem with the ip
> address but i have no clue how to solve it.
>
> Could anyone help me to configure the windows vista and the windows xp
> computers to recognize each other?
>
> Thanks in advance