Try the fix offered at this site:
Fix Windows Vista Help and Support
http://www.windows-now.com/blogs/kmk...d-support.aspx
It re-associates the .xml file type to its default settings. A recent
installation of a program may have "stolen" the .xml association.
"Kevin K4VD" <kevin@k4vd.net> wrote in message
news:9EE979CC-AA65-405D-A024-0006A7BB4433@microsoft.com...
>I tried opening Vista's help. It worked yesterday but not working today.
>Only change, I installed Winamp and did a reboot afterwards.
>
> I get a dialog box:
>
> Windows Internet Explorer
> Internet Explorer cannot download / from help.
> Internet Explorer was not able to open this Internet site. The requested
> site is either
> unavailable or cannot be found. Please try again later.
>
> Any ideas?
>
> Kevin