http://www.licenturion.com/xp/fully-licensed-wpa.txt
The automatic WFP daemon is fine, but you may run into occasions when you would like to
perform a signature scan yourself. Two utilities are available for this purpose: SIGVERIF and
SFC.
The SIGVERIF.EXE command-line utility, a.k.a. Signature Verification Tool, scans protected
system files and verifies their digital signatures. The program creates the log file
SIGVERIF.TXT to provide a record of the scan. You can use the program’s advanced settings
dialog box to scan nonsystem files, too.
Microsoft also provides a command-line program called SFC.EXE, for System File Checker.
You can use SFC to scan system files for digital signatures and/or to rebuild the contents of
the DLLCACHE folder if it becomes damaged – type SFC /? at a command prompt for more
details. Note that SFC does not show you the file details that SIGVERIF does, and it does not
let you scan non-system files. But SFC does offer to replace any system files for you.