PC automatically shuts down. Unable to find executable files

I have a PC that when I boot, I begin receiving errors that the .exe files cannot be found (taskmgr, ieexplore, lexmark ezprint.exe, etc......).  I downloaded MALWAREBYTES and ran a scan, and in the middle the PC showed a message that is was going to automatically shut down.  

Started PC again in safe mode under a different user ID.  Reran MALWAREBYTES with 50+ adware errors, but also showed VUNDO trojan and WORM.ARCHIVE.    Prior to fixing those errors I have run a HIJACK_THIS and I'm including the log file.  Does anyone see anything specific that would cause the auto shutdown and missing files ?

hijackthis.log
mat58Asked:
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sagiamarCommented:
try to run ComboFix in safe mode

download from here

http://www.combofix.org/download.php
mat58Author Commented:
More information on the shutdown error:

"Serious System Error: - Windows cannot continue due to fatal system error.  Forced to restart"
There are 2 user accounts on this PC.  One will work, but each time we log in to that account, it treates it as if it is a new profile and desktop.  The other one comes up with the system errors and unfound executables.  Anything I attempt to start on that account will not complete due to forced shutdown.
sagiamarCommented:
1.if you have enough time try to run "shutdown -a" command to stop the shutdown and run combofix.

also try to disable all startup programs and non microsoft services from the msconfig.

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mat58Author Commented:
Eliminating all excess programs from the STARTUP cleared the problem along with removing the malware found with MalwareBytes.  Re-enabled only those startup items that we were sure of.
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Windows Vista

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