How to fix iis 6 http error 401.1

I publish web site it works fine when i configure it on Integrated windows Authentication, but when i publish it on Digest Authentication for windows domain servers it returns Http error 401.1 - Unauthorized: Access is denied due to invalid credentials.
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mostabdoAuthor Commented:
please note that when i cecked the basic authentication (password is sent in clear text) option the web site is working fine
it fails only when i used the digest authentication
reference to the article posted the setspn.exe -S switch returned the following
Usage: setspn.exe [switches data] computername
  Where "computername" can be the name or domain\name

is there -S switch in setspn.exe

are you storing the website in the inetpub folder where anonymous users have access or are you storing it in a different folder in your machine and made a virtual site point to it.

if you did the second option make sure anonymous users have access to the folder..
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mostabdoAuthor Commented:
The website in the inetpub folder where anonymous users have access.
Paul MacDonaldDirector, Information SystemsCommented:
I'm unsure how well these match your problem, but they should be worth looking at:
mostabdoAuthor Commented:
the problem was fixed after installing .Net Frame work 2.0 & .Net Framework 3.0 & .Net Framework 3.5 with .Net Framework 4.0
the IIS Default web site is set to  .Net Frame work 2.0
my web site  is set to .Net Frame work 4.0
now the digest authentication works

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mostabdoAuthor Commented:
all the solutions provided was what i have found already while searhing about the error.
so i was expected to have more discussion with the experts in order to find out a solution than provide me with google search results
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Microsoft IIS Web Server

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