In order to open up the dashCommerce.sln file, I first had to update my version of Visual Studio here: http://www.microsoft.com/downloads/details.aspx?FamilyID=bb4a75ab-e2d4-4c96-b39d-37baf6b5b1dc&DisplayLang=en
Once I opened up the solution in VS, I right-clicked on the web folder and selected "set as startup project".
Once I did that, then I opened IIS and on the web sites folder, I right-clicked and selected New - Virtual Directory. I named the directory dashCommerce and then browsed to the dashCommerce/web folder.
Then I was able to open up IE and navigate to: localhost/dashCommerce/install/install.aspx and open up the config manager. I'm still having database connection issues, but hopefully I was able to get you past the point where you were stuck.
- Janessa