minispy stopping windows 7 startup

I am new to minifilters and device drivers. I was checking minispy sample code and changed the StartType to SERVICE_BOOT_START and the Windows is failing to boot. Startup repair is giving an error “Windows cannot repair this computer automatically”. I tried different options available through system recovery command prompt but could not fix the issue.

Is there any way to unregister this filter during boot sequence?
Would reinstalling fltmgr.sys help?

Bit screwed up ;-). Any help in this regard is highly appreciated.

I believe that using regedit.exe you might be able to change the start type
to manual (or remove the key completely if you’d rather do that).

Thanks,
Alex.

On Mon, Apr 13, 2015 at 11:21 AM, wrote:

> I am new to minifilters and device drivers. I was checking minispy sample
> code and changed the StartType to SERVICE_BOOT_START and the Windows is
> failing to boot. Startup repair is giving an error “Windows cannot repair
> this computer automatically”. I tried different options available through
> system recovery command prompt but could not fix the issue.
>
> Is there any way to unregister this filter during boot sequence?
> Would reinstalling fltmgr.sys help?
>
> Bit screwed up ;-). Any help in this regard is highly appreciated.
>
>
> —
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reboot the system and before going to repair mode select cmd prompt mode.
type X:\windows\system32\drivers.
Then either delete your driver or rename it using
for ex: del xxx.sys hit enter.
Reboot again.

Hope this may help.

Alex, NtDev thanks a lot for help.
When I tried regedit, the minispy filter entry could not be found.
Support engineer reverted the system to “last good known configuration” and the system started correctly.