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For clustering the Cluster resource name must have full access to the Virtual Cluster Names so when failover takes place DNS entries can be updated.

However if you used a underscore _ a big NO! NO! with NetBIOS and DNS names. Solution: wipe and start over.
If you used a dash -, an exceptable NetBIOS name, your still screwed and got this error. BUG in Windows 2008 R2. You can add the name manualy to the DNS, but it will not be automatic.

Following errors were recorded in event logs when it registrations fails:

场景1：

Cluster network name resource 'SQL Network Name (VirutalClusterName)' failed registration of one or more associated DNS name(s) for the following reason:
DNS signature failed to verify.

Ensure that the network adapters associated with dependent IP address resources are configured with at least one accessible DNS server
In DNS Management (dnsmgmt.msc):

1. Find the VirtualClusterName that is failing to register.
2. Right-Click Properties.
3. Select Security Tab.
4. Click Add.
5. Click Object Types.
6. Check off "Computers"; uncheck other options selected.
7. Enter in the name of the cluster (a.k.a Cluster Name Object (CNO)).
8. Click Check Names; Verify that the entry has been found.
9. Click OK.
10. Give the CNO FULL Control over this record.
11. Click OK.

场景2：

群集网络名称资源“群集名称”注册一个或多个相关联的 DNS 名称失败。原因如下:
DNS 服务器失败。

请确保与从属 IP 地址相关联的网络适配器已配置为至少可以访问一个 DNS 服务器。

相关资源：

Windows Server 2008 Troubleshooting: Event ID 1196 — Microsoft-Windows-FailoverClustering

DNS Registration with the Network Name Resource