A couple of things which may help:
- Make sure that the default document is set correctly - index.asp is not part of the standard setup for IIS7 (in IIS Manager, click on your website and you should see a Default Document icon)
- Try switching on the feature to send ASP debugging info to the browser (in IIS Manager, double-click the ASP icon, click the "+" next to "Debugging Properties", and set "Send Errors To Browser" to True)
If you have IIS setup correctly. the ASP page should at least run the code and give you some error information back, which hopefully will lead you to resolving your issue.