Зачем нужен sfilter.dll, откуда его брать?
Удалить все записи касающиеся sfilter.dll можно?
ТАК Я ТАК И СДЕЛАЛ. Только вот не знаю, работать будет, или нет... А как это сделать -- читай в "netsf.inf" и "netsf_m.inf"
Цитирую: 
; -- NETSF.INF --
;
; Sample Filter INF file
;
; Copyright (c) 1993-1999, Microsoft Corporation
; ----------------------------------------------------------------------
; Note:
; 1. Items specifically required for a filter have been marked with
;    "!!--Filter Specific--!!" keyword
;
; 2. 
A filter DOES NOT require a notify object for proper installation.;    A notify object is only required if one wants to have better control
;    over binding operations or if one wants to receive notifications
;    when other components get installed/removed/bound/unbound.
;   
 This sample uses a notify object as an example only. If you do not
;    want to use a notify object, please follow the instructions in (4).;
; 3. If you want to use this INF file with your own IM driver, please
;    make the following modifications:
;    File netsf.inf
;    --------------
;    a. In section [SourceDiskFiles] and [SFilter.CopyFiles.Sys]
;       change passthru.sys to the name of your own driver binary.
;    b. In section [SFilter.ndi.AddReg], change values of
;       BindForm and MiniportId to appropriate values.
;    File netsf_m.inf
;    ----------------
;    a. Replace MS_SFilterMP with InfId of your miniport.
;    b. In section [SFilterMP.AddService],
;       change ServiceBinary appropriately.
;    c. In section [SFilterMP.ndi.AddReg],
;       change "SFilter" in the line having "Service"
;       to reflect the appropriate name
;
;
 4. If you want to use this INF for installing the sample IM without
;    the notify object, do the following:
;    a. In section [SFilter.ndi.AddReg],
;       Comment out lines having ClsId and ComponentDll
;    b. In section [SFilter.ndi],
;       change the value of Characteristics so that it does not have
;       the NCF_HAS_UI flag
;    c. In section [SourceDiskFiles], comment out the line having sfilter.dll
;    d. In section [SFilter.ndi], remove SFilter.CopyFiles.Init from the
;       CopyFiles line.;
; ----------------------------------------------------------------------