Solution:
Search for Lsass.exe (make sure to search hidden files, folders and system files)
Right click and look at the properties of the Lsass.exe file
If the version number of the Lsass.exe file is earlier than 5.1.2600.2096, and Windows Service Pack 2 appears in the Add or Remove Programs tool, the computer is in an incomplete Windows XP SP2 state.
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