Hi
Make sure that the Router SSID is ON and broadcasting.
Take a look at the Wireless Connection Manger, and make sure that you
connection to your Router is first in line and set to Auto. Connect when
your Wireless is available.
http://www.ezlan.net/vista/wireless_manager.jpg
Jack (MS, MVP-Networking).

"neil154" <neil154@discussions.microsoft.com> wrote in message
news:3AB01084-C030-477E-A476-4E084BD2022D@microsoft.com...
>I have a desktop PC (running XP Pro) connected by wire to my router and it
> has no problems. I also have a Dell Studio 1555 laptop (running Vista 64
> Home Premium) connected to the router by wifi and it works fine most of
> the
> time. Every once in a while, maybe every 3 or 4 days) the lapto shows
> that
> it is disconnected from the network. When I try to reconnect it never
> reconnects. The only solution I have found is to reboot and then
> connection
> to the network always is fine.
>
> I have a second router and tried it and have the exact same problem so it
> is
> not the router. I have seen some items on the web which indicate that
> Vista
> might be the problem but I have not seen any solutions.
>
> Please advise if there is a resolution for this problem and if you know if
> this issue is resolved in Windows 7.
>
> Thanks for your help.