Try this script here:
http://www.paulsxp.com/forum/viewtopic.php?f=16&t=152
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"Robert Morley" <> wrote in message
news:...
> Hi everyone,
>
> I found LOTS of hits for this when Googling, but no clear-cut solutions
> that applied to me. At random points, my Volume and Network icons
> disappear from the Notification Area and when I try to restore them from
> the Properties menu, they're grayed out.
>
> The policy registry entries in both HKLM and HKCU don't exist, so that
> shouldn't be the problem.
>
> A simple log out/log in typically restores them, but is usually too much
> of a nuisance to bother doing. If that's the only reliable method, that's
> what I'll use when I really need to, but if someone's got a more long-term
> solution that prevents the problem in the first place or can fix it
> on-the-fly, that'd be great!
>
>
> Thanks,
> Rob