RogueKiller BSOD

Hi!

I'm cleaning up a laptop for my son after pop-ups, unwanted tabs and redirects made browsing difficult and slow; and the system would be consumed with HDD accesses for 2-3 seconds every 15 seconds, interfering with running applications.

First Cut:
- Unneeded services were changed to the "manual" setting, and the Indexing Service was turned off.
- Spybot S&D was run from the UBCD4Win CD. It fixed 191 problems (adware); but Coupon.Bar, W3i.IQ5.fraud, Yontoo.Pagerage, and Zlob.Downloader.apl couldn't be fixed since a re-boot was required and that would've simply re-booted the read-only CD-R.
- MS Safety Scanner ran, but it found nothing.

Default Browser Reset:
- Following MajorGeeks suggestion, reset Firefox. This solved the Firefox browsing problems (thank you), including multiple unwanted tabs, homepage hijack, continual adware, etc.

READ & RUN ME FIRST:

Step 1: Followed General House Cleaning guide in "Fixing Google Redirection/Hijacking and Other Redirection Problems": flushed the Java cache, the Firefox cache, the IE cache, and the DNS cache.

Step 2: Uninstall Multiple Protection Applications:
- Only McAfee anti-virus is installed, and it's turned off.
- The only installed firewall is the XP firewall, and it probably isn't active.

Step 3: Configuration and Setup:
- 32-bit Windows XP SP3 is installed.
- Enable viewing Hidden, System Files and Folders: Done.

Step 4: Disable CD Emulation drivers:
Didn't think there were any on the system, but ran Defogger just to make sure, clicked Disable, and it didn't find any.

Step 5: Temp File/Folder Cleaning:
Ran CCleaner 4.13 without modification, except unchecked Cookies on both the Windows and Applications tabs.

Step 6: Windows OS Specific Cleaning Instructions:
Windows XP Malware Removal/Cleaning Procedure:

Step 1: Downloaded RogueKiller 8.8.15, Malwarebytes Anti-Malware 2.01.1004 Final, TDSSKiller 3.0.0.34l, Hitman Pro 3.7.9 Build 216, and MGtools.exe, as directed.

Step 2: Opened RogueKiller.exe. It immediately started a scan without pressing Scan button. After scanning for a minute, BSOD appeared:

"A problem has been detected and Windows has been shut down to prevent damage to your computer. If this is the first time you've seen this stop error screen, restart your computer. If this screen appears again, follow these steps:
Check to be sure you have adequate disk space. If a driver is identified in the stop message, disable the driver or check with the manufacturer for driver updates. Try changing video adapters.
Check with your hardware vendor for any BIOS updates. Disable BIOS memory options such as caching or shadowing. If you need to use Safe Mode to remove or disable components, restart your computer, press F8 to select Advanced Startup Options, and then select Safe Mode.
Technical information:
*** STOP: 0x0000008E (0xC0000005,0xA8B09289,0xBAF0EF58,0x00000000)
*** dxec02.sys - Address A8B09289 base at A8AF6000, Datestamp 454a3986
Beginning dump of physical memory
Physical memory dump complete.
Contact your system administrator, etc."​

This computer hasn't ever crashed as far as I know, has at least 20 GB free disk space, the video adapter is probably soldered onto the Mobo, and the BIOS hasn't been a source of problems.
I haven't touched anything and have left the machine powered up with the BSOD, awaiting your instructions. No hurry, but I would like to eventually complete the whole "Windows XP Malware Removal/Cleaning Procedure". Thank you.

(Config: XP Pro SP3 on Dell Vostro 1500, Core 2 Duo, 2+ GB RAM, 60 GB HDD.)