Well, that file is not on my XP Pro SP3 system and it is not a Windows
Protected File. Sounds like some leftovers from some other
affliction.
Sometimes malware will assume a file name that looks odd - like that
one. There are generally notbe too many .DLL files in c:\windows
anyway - the XP ones are usually in c:\windows\system32, so it is even
more suspicious.
Sounds like it could have been leftover from something or some other
anti-something removed most of a previous affliction. Sometimes the
scanners can't remove every trace.
MBAM is a good choice when weird things start happening, I would run
SAS as well since it is also good and if MBAM found "something", there
could be something else. No single scanner seems to know about
everything so use a couple good ones.
Perform some scans for malicious software, then fix any remaining
issues:
Download, install, update and do a full scan with these free malware
detection programs:
Malwarebytes (MBAM):
http://malwarebytes.org/
SUPERAntiSpyware: (SAS):
http://www.superantispyware.com/
They can be uninstalled later if desired.