BSOD repeating after memory testing, reinstallation of OS.

Hi guys,

I've got a client who's running a Fujitsu Lifebook S6510 - we've done memory testing, cpu testing, isolation tests. As well as that, we've reinstalled Windows from a clean OEM cd, and installed all drivers from scratch. However, she keeps on getting BSOD from time to time - either once a day or once a week. The BSOD reports the following:
==================================================
Dump File         : Mini042410-01.dmp
Crash Time        : 24/04/2010 3:33:21 PM
Bug Check String  : BAD_POOL_HEADER
Bug Check Code    : 0x00000019
Parameter 1       : 0x00000020
Parameter 2       : 0x8a57fbe0
Parameter 3       : 0x8a57fcc8
Parameter 4       : 0x0a1d000d
Caused By Driver  : rdbss.sys
Caused By Address : rdbss.sys+6e9f
File Description  : Redirected Drive Buffering SubSystem Driver
Product Name      : Microsoft® Windows® Operating System
Company           : Microsoft Corporation
File Version      : 5.1.2600.5512 (xpsp.080413-2111)
Processor         : 32-bit
Computer Name     :
Full Path         : C:\WINDOWS\Minidump\Mini042410-01.dmp
Processors Count  : 2
Major Version     : 15
Minor Version     : 2600
==================================================

==================================================
Dump File         : Mini042110-03.dmp
Crash Time        : 21/04/2010 11:24:16 AM
Bug Check String  : BAD_POOL_HEADER
Bug Check Code    : 0x00000019
Parameter 1       : 0x00000020
Parameter 2       : 0x89a3dd70
Parameter 3       : 0x89a3de50
Parameter 4       : 0x0a1c0013
Caused By Driver  : ntoskrnl.exe
Caused By Address : ntoskrnl.exe+22f43
File Description  : NT Kernel & System
Product Name      : Microsoft® Windows® Operating System
Company           : Microsoft Corporation
File Version      : 5.1.2600.5938 (xpsp_sp3_gdr.100216-1514)
Processor         : 32-bit
Computer Name     :
Full Path         : C:\WINDOWS\Minidump\Mini042110-03.dmp
Processors Count  : 2
Major Version     : 15
Minor Version     : 2600
==================================================

It also sometimes reports AFTAnsi.sys, fltmgr.sys or mup.sys, but more often the above. The ntoskrnl.exe is the most common (90%).

Any ideas as to what would be causing this? I find it really weird that it's happened over a full reinstall, with no apparent hardware problems. Just some random ghost in the hardware or something?

Cheers
LVL 2
jbuzzardAsked:
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nobusCommented:
since it is not clearly pointing to any part, it is the cpu or the mobo imo.
can you test the cpu on another mobo, or test with another cpu ?
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jbuzzardAuthor Commented:
Unfortunately it's a laptop, so no. However, I have stress tested the CPU, and it comes up fine... So maybe just the motherboard ghosts...
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edbedbCommented:
I don't trust memory tests. Try checking it this way. Reseat the modules. Replace it or try using 1 memory module at a time in different slots.
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nobusCommented:
you can replace laptop cpu's as well...
use the memtest86+ from ubcd : http://www.ultimatebootcd.com/      
and yes, no diag is 100% - always room for a tiny bit of errors, but a good starting point
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acl-puzzCommented:
sp3 is latest service pack but i have seen it doesnt work on many pcs ntoskrnl.exe is an kernel file as you know and this kernel simply saying it cant bear or load some of the hardware modules that exists on this pc so better you go for SP2
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jbuzzardAuthor Commented:
@acl-puzz - I've worked on a fair few machines with SP3 now, and it seems fine.
@nobus - it's an older laptop, and I didn't actually know you could replace laptop cpus - I thought they tended to be quite set in place.
@edbedb - tried that before the memory tests.

I've done another full reinstall with a different CD, and it seems stable enough now. Maybe the cd was corrupt (which is weird, since I've used it to install on a lot of different computers)

Cheers for the help.
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nobusCommented:
tx for the feedback; and have fun..
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jbuzzardAuthor Commented:
Thanks for the help!
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