Relative Path Problem - ASP Classic to ASP.NET

Hey guys,

Problem Background
One of our large applications developed using ASPs. I developed part of that application in ASP.NET 1.0.

Directory Structure of the application is
D:\App1\Module1\

My asp.net code is under
D:\App1\Module1\ASPNETModule

Some ASP forms from Module1 directory are calling asp.net forms (asp.net forms are under ASPNETModule directory).

And after I complete my process on asp.net forms then I want to redirect control again to the ASP forms.

My Code that is called from the asp form is;
<a href="ASPNETModule/aspnetform1.aspx?RefNumber=<%=rs.Fields("Fld1")%>">ASPNET Form</a>

Error Occurs
When I click this hyperlink following errors occurs;

Parser Error Message: It is an error to use a section registered as allowDefinition='MachineToApplication' beyond application level. This error can be caused by a virtual directory not being configured as an application in IIS.

Line 46: by Microsoft that offers a single logon and core profile services for member sites.
Line 47: -->
Line 48: <authentication mode="Windows" />
Line 49:
Line 50: <!-- AUTHORIZATION

This is one issue, another issue is when I want to comeback from asp.net form to asp form then it give me some other error. I will relay that problem after I resolve the above mentioned issue.

I am really pissed off because of this issue.

Your help will be much appreciated.

Thanks & Best Regards,