bhartzer - 5:05 pm on Apr 30, 2012 (gmt 0)
Do you currently have your index.asp file set as the home page of your site (on the server)? If not, and you're using another file, then setting up a 301 redirect from index.asp to your home page (www.domain.cm) should help.
There are, though, links out there pointing to your index.asp URL.
Try searching for that url using quotes in Google to see where it's mentioned. I would also try to analyze the backlinks, using Open Site Explorer or Majestic SEO (preferred).