Well it is a bit strange finding anything in the prefetch folder as this SEARCHFILTERHOST.EXE-44162447.pf (.pf file) just contains location information the SEARCHFILTERHOST.EXE file.
Now I don't know if it is also following links in relation to this .pf file, which should lead it to the primary file. You can send it to the chest on detection but since you are running searchfilterhost.exe that .pf file would be recreated after a few reboots.
Lots of hits about this primary file
http://www.google.co.uk/search?q=SEARCHFILTERHOST.EXE and some consider it bad.
But it is associated windows search indexing, so you could disable that function, if you don't particularly use this indexing, see
http://social.technet.microsoft.com/Forums/en-US/w7itproperf/thread/0321bed5-a9ad-49bf-b8e8-5bde8a05753f/ and
http://www.processlibrary.com/directory/files/searchfilterhost/28179/.
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You could also check the offending/suspect file (SEARCHFILTERHOST.EXE-44162447.pf) at:
VirusTotal - Multi engine on-line virus scanner and
report the findings here the URL in the Address bar of the VT results page. You can't do this with the file securely in the chest, you need to extract it to a temporary (not original) location first, see below.
Create a folder called
Suspect in the
C:\ drive. Now exclude that folder in the
File System Shield, Expert Settings, Exclusions, Add, type (or copy and paste)
C:\Suspect\* That will stop the File System Shield scanning any file you put in that folder.
