ok so my computer is running xp pro and it had recently gotten some update from windows update and after the restart it seemed to change some of the mods that i had done to the computer visually, by that i mean just different theme mods. so i try to uninstall these themes and upon that restart i get this error msg everytime

STOP: c000021a {Fatal System Error}
The Windows SubSystem system process terminated unexpectidly with a status of 0x
c0000005 (0x7ffe0291 0x0015fab8).
The system has been shut down.

every reboot gives me this error. ive tried safe mode ive tried last good configuration, and all still give me this msg. this is now the second time this has happened. the first time it happened i just reformated the hard drive and was on my way... only reason im here now is cause its just a pain to back up the HD info manually from another computer and then reformat. So any ideas here? any fixes would be greatly appreciated. thanks

This is the Microsoft page on that error:

http://www.microsoft.com/resources/d...d_stp_mtgk.asp

If you cannot boot into Windows I would suggest first trying the Recovery Console:

http://support.microsoft.com/default...b;EN-US;314058

To try to fix the boot:

Assuming that your XP is on C: then:

Type:

FIXMBR C:

then enter. After that completes type:

FIXBOOT C:

then enter. After that completes type:

BOOTCFG /rebuild

then enter. After that completes type:

EXIT

then reboot.

If in the process you are asked to run chkdsk say YES.

Also after the BOOTCFG /rebuild you will be prompted to:

C:\Windows
1. Add installation to boot list? (Yes/No/All):
2. Enter Load Identifier: (Custom description for an operating system loading from the Boot menu)
3. Enter Operating System Load Options: (that is: /fastdetect)

Reply:
1. Yes
2. XP
3. /fastdetect

If this fails you can run a Repair Install that will leave your data entact:

http://michaelstevenstech.com/XPrepairinstall.htm

As to why this is happenning is another issue. You say this is the second time? The exact same error?
That Microsoft page indicates this is due to third party software & or security/virus issues.
Do you have theme software? Window Blinds etc.?
Do you have SP2 and all Critical Updates?