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You can delete the O2, but not the O23. Actually, don't fix (file missing) O23 entries, it is a glitch with HijackThis. That is what AsSaSs@1N told me.
Posts: 104
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O2 - BHO: (no name) - {02478D38-C3F9-4efb-9B51-7695ECA05670} - (no file)
You may remove O2, O3 and O9 lines which have (no file) and (file missing) only.
Therefore this service should not be fixed:
O23 - Service:@%systemroot%\system32\spoolsv.exe,-1 (Spooler) - Unknown owner - C:\Windows\System32\spoolsv.exe (file missing)