This is popular question. You may have two options. Check this post.
Vista doesn't remember mapped drives
4 posts - Last post: Mar 27, 2008
What if Windows logon Credential is greyed out beacuse it's Vista Home
Premium? At least that's the only reason I can think it's greyed out. ...
http://www.chicagotech.net/netforums...pic.php?t=1570
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Bob Lin, Microsoft-MVP, MCSE & CNE
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"Tom Newton" <nothing@gmail.com> wrote in message
news:13BEF8C3-77B9-4E81-B4AB-C3D204DD0524@microsoft.com...
> Is there a way to make Vista Home Premium remember network passwords so I
> do
> not have to re-enter them every time I re-start my computer. I have tried
> checking the remember password option but it does not do anything.
>
> Simply want to maintain a network connection to 2 computers and a shared
> printer on a home network. Please don't tell me that Vista Home Premium
> doesn't remember network passwords and Vista Business and Ultimate do!
> Please tell me there is a fix