You could salvage this by creating the group and adding the items and dependencies back manually, make sure that you have all the information that you built the cluster with so that things are put back together right.

1. First create add all the disk resources for the group (right click, new resource, physical disk)

2. Once all those have been added create the resource for the SQL IP Address (right click, new resource, IP Address)

3. Then add the SQL Network Name (right click, new resource, network name) and make this dependent on the IP Address

4. Add the SQL Server service (right click, new resource, SQL Server) and make this dependent on all the disks and the network name

5. Add the SQL Server Agent server (right click, new resource, SQL Server Agent) and make this dependent on the SQL Server resource

Bring everything online and you should be all happy happy.