Getting things to work without adding a foldername/ to all includes and paths in an application

I recently got this huge application written in classic asp that came to me in a zip file called 

ivx

. I'm on IIS 7 running on Windows 7 64 home premium on my laptop.
What I've now done is unzipped ivx

 to 

inetpub/wwwroot

. So it's now 

c:/inetpub/wwwroot/ivx/

The problem is, the entire application contains includes and other things pointing to the root (my guess is this was pulled down directly from the server).

<!--#include virtual = "/main/indexfunctions.asp" --> 

<!--#include virtual = "/common/adminverify.asp" -->

To get things working, I'll have to add 

/ivx

 to each and every path in the application. I know I can get thing going if I unzip all files to the root directory, but I cannot do that since there are other files there.

How can I make this whole thing work without having to add the current folder name to all the paths in the application? Is there a setting somewhere in IIS or elsewhere that'll let me do this?