Umbraco newbie here.

I installed umbraco and had everything working for a few days.  I then tried to open it in visual studio.  Now when I go back to my site nothing loads in my admin window.  My content tree is gone, although I the search still works and I can find something in my content tree.

Any ideas?  maybe i need to just copy over eveything in the umbraco folder and start over?

Thanks!

-Nate