Dreamweaver installed, by chance? If so, see the following TechNote from Adobe:
Vista help system stops working when Dreamweaver is the default XML editor:
Error "Internet Explorer was not able to open this Internet site" when using Help and Support in Windows Vista:
Ramesh Srinivasan, Microsoft MVP [Windows Shell/User]
Windows┬« Troubleshooting http://www.winhelponline.com
"Paddy Ryan" <PaddyRyan@discussions.microsoft.com> wrote in message news:719C6E22-50D9-4B51-94D6-B00E57B4467D@microsoft.com...
Thanks Mary but the problem lies with Vista help ... not the program's. Vista
help just doesn't load anymore. It brings up the message "Internet Explorer
cannot download / from help" opens an empty box and then shows a download in
progress that never gets past 0%.
> Not sure if this applies--Any program that depends on Windows Help file, Help
> will not be available in that program. Vista has a diff help system. Here's
> the explanation: http://support.microsoft.com/kb/917607
> "Paddy Ryan" wrote:
> > I installed several new software packages and now Help and Support won't
> > load. The window appears but it is empty.
> > Any ideas