In dire need of help with my windows xp

[seagates]

A couple of days ago I recieved the new Sp3 update. I installed it but soo
had to unistall in due to system instability. While uninstalling my laptop
lost power. Now it won't reach the main desktop, the loading screen come up
and the after that a screen says "autochk program not found - skipping
AUTOCHECK" once that screen comes up the system restarts and continues to do
it. I tried the "last known config" and still the same problem. I also tried
starting in safe mode but the same thing happens.....restart after loading
screen. I started it up again with the "no restart on system failure" and the
same thing but then the blue screen comes up and reads "STOP: c000021a {Fatal
System Error} The session manager intialization system process terminated
unexpectedly with a status of 0xc000003a (0x000000000 0x000000000). The
system has been shut down." I have no idea what to do please someone help!!!!
I have Windows Xp Pro

 

[Leonard Grey]

Time to show your computer to a professional. You will probably need to
reinstall Windows.

"How to troubleshoot a "STOP 0xC000021A" error"
http://support.microsoft.com/default.aspx?scid=kb;en-us;156669

Never install or uninstall software to a laptop while it's on battery power.

A UPS will protect your computer during a temporary blackout and allow
you to shutdown in an orderly manner.