Please check whether you copied the files from App_Data/Sitefinity/Configuration. You can try to programmatically create an administrator.
var userManager = UserManager.GetManager(
var user = userManager.CreateUser(
RoleManager roleManager = RoleManager.GetManager(
var role = roleManager.GetRole(
the Telerik team
Do you want to have your say in the Sitefinity development roadmap? Do you want to know when a feature you requested is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items