BSOD 0x0000007E after updating XP sp2

Hi,

I recently had cleaned my windows XP (sp2) pc (Abit Ic7G intel P4 2.4ghz) using the following guide (http://forums.majorgeeks.com/showthread.php?t=139313) as it was hanging after logging in.
After I fixed that problem and then went through this guide (http://forums.majorgeeks.com/showthread.php?t=44525) to keep my pc free from rubbish. Still booting fine so I made a restore point.
Next I Installed the XP updates/patches...which I hadn't done for a while. After installing 70 odd updates/patches (including sp3) the machine rebooted only to come back with a BSOD with the following error:

*** STOP: 0x0000007E (0xC0000005, 0x805ED9A7, 0xF78C93B0, 0xF78C90AC)

I then tried booting in to safe mode and it produced the same BSOD...it came up after or during loading 'agp440.sys.

So I googled the fault an tried the following fixes (note: I can only get in to the recovery console now from boot off my windows CD)

1. Turned off the agp440.sys service from loading (http://support.microsoft.com/kb/324764)

2. Removed some suspect patches: (http://en.community.dell.com/forums/p/19321239/19663986.aspx)

KB971468

KB975560

KB977165 (note: this wasn't installed on my machine but does seem to cause a the same error)

KB977914

KB978037

KB978251

KB978262

KB978706

3. Removed sp3 (http://support.microsoft.com/kb/950249)

4. copied a old system restore point...which I made before downloading the updates (http://www.myfixes.com/articles/system)

Now I'm stuck and its still producing the same fault...please help.

 

I appear to have fixed it...down to a corrupted iastor.sys file

I copied the mini .dmp file located here: C:\windows\minidump to a floppy

note: if you get a access denied trying to do this in windows recovery mode you need to allow the permission to write files to the floppy type in the following line:

set AllowRemovableMedia = TRUE

I then installed blue screen view (http://www.nirsoft.net/utils/blue_screen_view.html) on a working pc to look and the error...which was related to iastor.sys

I then copied an original iastor.sys file off my installation disk to c:\windows\system32\drivers\

appears to be booting ok now.

does anyone know how iastor.sys can get corrupted...do you think ti was the fault of the updates or some prior bug?