IRQ_NOT_LESS_OR _EQUAL Blue Screen STOP Error

IRQ_NOT_LESS_OR _EQUAL Blue Screen  STOP Error upon bootup.  Tried every suggestion I could find including turning off memory cache in bios, and disabling all hardware devices that I could.  Tired to boot to safemode in order to check for conflicts, Viruses, etc but got 'XP cannot use safe mode' error.
Installed another instance of Xp Pro, patched it, and installed symantec AV, Spware Dr, and scanned entire disk. AV found nothing, Spyware DR found 3 tracking cookies, but no real threats.  Everything I read pointed to hardware corruption, conflict, bad memory or other hardware, (Fan, Mother board) Bios flash,  or possible virus, but it seems to be OS related as I can install fresh instance and am OK.  
Searched: http://www.google.com/search?hl=en&q=IRQL_Not_less_or_equal&btnG=Search and many others and nothing referes to OS except to suggest there may be a virus. Now I can access all folders on C:\ except my Document & Settings profile (no permissions) and I'd have to reinstall all apps.
Question can I still recover the other install? Identify problem/corrupt system files, etc from this point?
khowe34Asked:
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Alan Huseyin KayahanCommented:
     * Under BIOS settings if you see a line " PNP Os installed" seti it as YES.
      *In recovery console when you boot from XP cd, you should run a chkdsk /f.
      *Only thing you should do is copying your profile folder under documents and settings and pasting it into your new installation. After you install your new OS and create user, change the folder names of profile folders under safe mode with command prompt so that your user will use your previous profile folder.
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khowe34Author Commented:
Actually, I already did the parellel install, and I will go back and try to run chkdisk off of the recovery console, but I don't recall being given that option. The disk I have for this machine is XP Professional w/ no service pak, so I packed it all up to current after the install.

I used this article to gain access to the folder in question, but I would like to be able to boot to either instance of XP ( the original install was packed to date as well, and proteced with ample spyware ad ware and AV, but maybe something got though. I have reinstalled AV and scanned, but I don't know how to check the old registry, unless I am in that old instance.

Under BIOS, I do not find PNP Os parameter.
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khowe34Author Commented:
I forgot to include the MS article I used. It is KB 810881

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