blowdart said:
It's will get there eventually, just not yet.
Note By default, Network Level Authentication (NLA) is disabled in Windows XP Service Pack 3. To enable NLA, you have to turn on the Credential Security Service Provider (CredSSP). For more information about how to trun on CredSSP, click the following article number to view the article in the Microsoft Knowledge Base:

http://support.microsoft.com/kb/951608/