Q.    MBSA uses files that it downloads from the Internet, but the computer I want to use to scan my network doesn’t have Internet access. How can I use MBSA in an offline and secure environment?
A.    You can either perform the scan using the mbsacli command-line utility with the /nd (do not download) parameter, or you can perform the scan using the GUI. Before scanning you must copy the necessary files to the computer performing the scan. There are three types of files that are required:
..After downloading the files from the Microsoft Web site, copy all files listed above to the following folder on the computer performing the security update scan: C:\Documents and Settings\<username>\Local Settings\Application Data\Microsoft\MBSA\2.1\Cache
…- Question 33, Microsoft Baseline Security Analyser 2.1 FAQ

“C:\Documents and Settings\<username>\Local Settings\Application Data\Microsoft\MBSA\2.1\Cache” does not exist until you either create it manually OR connect the computer to the internet and have MBSA download the file.  MBSA downloading the file defeats the purpose really.

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