An AyaNova user setting up WBI on his Windows XP Pro computer that has IIS 5 installed performed step #2 of the WEBtesting steps and received HTTP 500 error in the web browser attempting to get the WBI login screen
The AyaNova user checked his Event Viewer log, and the following error had been logged: dir=ltr " ">
The server failed to load application ‘/LM/W3SVC/1/ROOT/WBI’. The error was 'Class not registered
Performed a search online, and found this very helpful web page which identifiespossible solutions for this issue having to do with Windows components themselves affecting where IIS can load ASP pages or not.
http://msmvps.com/blogs/bernard/archive/2005/03/22/39216.aspx
If you encounter such an issue, do check out this link, and review the postings that are listed on that page as possible solutions to resolve your computer issue.