I created the ASP.NET dll with one function that i need to use in Classic ASP page.
I used the below code for creating object in classic asp page
set
On this website :
http://connect.microsoft.com/VisualStudio/feedback/details/294241/kb937143-breaks-asp-to-net-com-interop
They fix the problem with giving read access to IUSR on HKEY_USERS\S-1-5-20\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones.