I realize that your message was dated June but I am having the exact same
problem and hope that maybe you can help, that is, if you ever got your
problem solved. I haven't been able to get past mup.sys either and cannot
boot safe mode, or any other F8 option after uninstalling SP 2 through
control panel. What worked for you? I'm running a Sony VAIO PC with XP Home
Edition and unfortunately my XP is bundled in the recovery disks that Sony
sold with the computer. I also don't get the opportunity to view the
particular Stop error, my system just goes into a continuous cycle of trying
to reboot. Thanks for any help you might have.
(E-Mail Removed).
"Hass" wrote:
> This is a long story so please bear with me,
>
> I can't boot anymore after I installed sp2. I have a home built
> athlon64 machine w/ xp Pro. I can't boot into safe mode or nothing. The
> machine freezes after trying to load "Mup.sys." and dies with the
> error:
>
> STOP C000021A (Fatal System Error)
> The session manager initialization system process terminated
> unexpectedly with a status of 0xC000026C (0x00000000, 0x00000000). The
> system has been shut down.
>
> I've tried renaming Mup.sys and it fails on the driver before that
> (vmodem.sys). I don't know what the driver would be after Mup.sys but
> commonly (I think) it is agp440.sys which I renamed to no avail. Based
> on my research I don't think it had anything to do with Mup.sys or a
> driver. In the microsoft KB there is info on STOP C000021A but the
> status is not 0xC000026C.
>
> I have not found a solution and I liked the idea of uninstalling SP2
> through the recovery console, as per the MS KB. I get there but there
> is no $NtServicePackUninstall$ directory!! (I wrote the background at
> the end of the post which points out that the machine thought SP2 was
> installed succesfully). My question right now is how can that be????
> There are many $NtUnistallKBxxxxxx directories with the date stamp of
> the night of SP2 installation but no $NtServicePackUninstall$.
>
> Any suggestions on why this is and how can I get rid of whatever
> happened (e.g. spuninst.exe each of the hotfixes???)
>
> I'm trying to do everything short of a repair install so any ideas are
> appreciated.
>
> The Background:
>
> Initially I installed sp2 through automatic updates. At the end it
> complained that the installation failed and it had to uninstall the SP
> (that "items ... manifest ... verification ... failed ..." crap). So it
> uninstalled and reported that "Windows may not work properly."
>
> I got lucky and windows booted and seemed to work fine. I researched
> this and found many recomendations to avoid the automatic updater and
> downlaod the full (272meg) SP2 file and install from that. Stupid me
> (slap myself), insisting on installing sp2, went ahead and did that
> (download + install). It said that the installation was comleted
> successfully. Now I can't boot at all anymore (safe mode, vga mode,
> last known good mode, whatever.)
>
> I have tried removing both cdrom drives, and my crappy (not MS
> certified) modem. I don't have integrated video so I can't remove the
> NVIDIA video card. I'll try removing the sound card tonight.
>
> Enough rambling from me and thanks for your time.
>
>
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