I'll leave this one to my betters:
"NTLM 100% Broken Using Hashes Derived From Captures"http://it.slashdot.o...erived-from-captures
"Microsoft has posted a little guidance for those who need to turn off NTLM."http://support.microsoft.com/kb/2793313
Systems that are affected in a default configuration are primarily at risk, such as systems that are running Microsoft Windows NT 4, Windows 2000, Windows XP, and Windows Server 2003. For example, by default, Windows XP and Windows Server 2003 both support NTLMv1 authentication.
To have us fix this problem for you, go to the "Fix it for me" section.
Fix this problem
Microsoft Fix it 50969
So how serious is this for ordinary home users? If I click "Fix it" will I suddenly lose my Wifi connection?