Nessus scanning basics - Windows vulnerabilties

I am new to Nessus and am trying to use Nessus 2.2.6 to scan a Windows XP 
machine.  It's right out of the box, no patches.  The scan does not catch 
anything.  If I run the scan on another XP machine I have, it picks up the 
following vulnerability:

Vulnerability   microsoft-ds (445/tcp)   
 Synopsis :

 Arbitrary code can be executed on the remote host.

 Description :

 The remote version of Windows contains a flaw in the Web Client service which 
 may allow an attacker to execute arbitrary code on the remote host.

 To exploit this flaw, an attacker would need credentials to log into the 
 remote host.

 Solution : 

 Microsoft has released a set of patches for Windows XP and 2003 :

http://www.microsoft.com/technet/security/bulletin/ms06-008.mspx

 Risk factor : 

 Medium / CVSS Base Score : 6 
 (AV:R/AC:L/Au:R/C:C/A:C/I:C/B:N)
 CVE : CVE-2006-0013
 BID : 16636
 Nessus ID : 20928          
I think there would be numerous vulnerabilities on an unpatched Windows 
machine.  Is there a reason why the same set of plugins would see the 
vulnerability on one machine and not on the other?

Thanks,
Susan

                
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