After upgrade to 2.7,all links lost

Topics: ASP.NET 2.0
Feb 1, 2013 at 8:43 AM
My website on godaddy,after upgrade my website from 2.6 to 2.7 in godaddy's manager window,my website's all link lost,when I click a post's link to see full article,It's says not found,so I just roll back,please tell why and how to resolve it