>The strange this is that it works at work, but it doesn't work at home. Here is a bit more information.
>
>When at home, if I surf to www.lavasoftusa.com I get:
>A windows authentication style popup asking for my username and password
>If I hit cancel I get the redirected to http://www.lavasoftusa.com/localstart.asp
>with the following error text.
>
>************
>You are not authorized to view this page
>You do not have permission to view this directory or page using the credentials you supplied.

That is strange. I thought it was the reverse situation, which is not so unusual. A couple things come to mind:

1) Could you have an older cached page copy?
2) Could your ISP be involved somehow?
3) Have you tried the German (original) site? (http://www.lavasoft.de)