window xp iis 5.1 error

I often coded Dot Net with interface com+ and iis
But I recently had problem in iis 5.1 at window xp
I think it's very terrible experience. I'm so unskilled at iis
Then I didn't find the problem com+ interface and iis 5.1 communication problem
but I tested the other upgrade iis. It's great well functioned.
Coder is necessary to have curious all about things but I don't
who can tell me this problem ? I'm so curious ...

reference site
http://msdn.microsoft.com/en-us/library/ms524510(v=vs.90).aspx
http://support.microsoft.com/default.aspx?scid=kb;en-us;315296