I just solved a similar problem on my laptop - I use a wireless connection
and it was losing internet after sleep (but not restart). Solution for me
was to disable the built-in ethernet card which I don't use.

"Lakesidezx" <lakesidezx@nowhere.net> wrote in message
news:296AAC69-0A74-4D2B-BF47-10B49DC9CD9F@microsoft.com...[color=blue]
> I've finally managed to get vista to sleep properly (in the past it would
> just wakeup after 2 seconds after setting the computer to go to sleep) but
> now I have another problem.
>
> Upon waking up the computer from sleep the network internet connection is
> dead and no sites are reachable, I use the repair option for the network
> card but it just reports back that there is something wrong with my ISP
> and
> that I should contact them. A full reboot solves the problem and the
> computer works fine so it's not a problem with my ISP.
>
> I've unchecked the box so that vista doesn't turn off the network card's
> power on both network cards(which are built onto the mainboard) but it
> still produces the problem of
> the network internet being down upon waking from sleep.
>
> Is there anything else that I need to do to make this work properly after
> waking from sleep?
>
> Thanks for the assistance.[/color]