intelppm.sys. Why could this give a bluescreen?

Some D620 machines at work keep bluescreening on the intelppm.sys driver so it seems.

Microsoft (R) Windows Debugger  Version 6.7.0005.0
Copyright (c) Microsoft Corporation. All rights reserved.


Loading Dump File [D:\Profiles\awshp\Desktop\Mini121907-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available

Symbol search path is: SRV*c:\websymbols*http://msdl.microsoft.com/download/symbols
Executable search path is:
Windows XP Kernel Version 2600 (Service Pack 2) MP (2 procs) Free x86 compatible
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 2600.xpsp_sp2_gdr.070227-2254
Kernel base = 0x804d7000 PsLoadedModuleList = 0x8055c700
Debug session time: Wed Feb 13 21:58:02.765 2008 (GMT+1)
System Uptime: 0 days 2:52:43.511
Loading Kernel Symbols
.......................................................................................................................
Loading User Symbols
Loading unloaded module list
..............
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*                        Bugcheck Analysis                                    *
*                                                                             *
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Use !analyze -v to get detailed debugging information.

BugCheck 9C, {0, bab3c050, b2000040, 800}

Probably caused by : intelppm.sys ( intelppm!AcpiC1Idle+12 )

Followup: MachineOwner
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1: kd> !analyze -v
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*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
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MACHINE_CHECK_EXCEPTION (9c)
A fatal Machine Check Exception has occurred.
KeBugCheckEx parameters;
    x86 Processors
        If the processor has ONLY MCE feature available (For example Intel
        Pentium), the parameters are:
        1 - Low  32 bits of P5_MC_TYPE MSR
        2 - Address of MCA_EXCEPTION structure
        3 - High 32 bits of P5_MC_ADDR MSR
        4 - Low  32 bits of P5_MC_ADDR MSR
        If the processor also has MCA feature available (For example Intel
        Pentium Pro), the parameters are:
        1 - Bank number
        2 - Address of MCA_EXCEPTION structure
        3 - High 32 bits of MCi_STATUS MSR for the MCA bank that had the error
        4 - Low  32 bits of MCi_STATUS MSR for the MCA bank that had the error
    IA64 Processors
        1 - Bugcheck Type
            1 - MCA_ASSERT
            2 - MCA_GET_STATEINFO
                SAL returned an error for SAL_GET_STATEINFO while processing MCA.
            3 - MCA_CLEAR_STATEINFO
                SAL returned an error for SAL_CLEAR_STATEINFO while processing MCA.
            4 - MCA_FATAL
                FW reported a fatal MCA.
            5 - MCA_NONFATAL
                SAL reported a recoverable MCA and we don't support currently
                support recovery or SAL generated an MCA and then couldn't
                produce an error record.
            0xB - INIT_ASSERT
            0xC - INIT_GET_STATEINFO
                  SAL returned an error for SAL_GET_STATEINFO while processing INIT event.
            0xD - INIT_CLEAR_STATEINFO
                  SAL returned an error for SAL_CLEAR_STATEINFO while processing INIT event.
            0xE - INIT_FATAL
                  Not used.
        2 - Address of log
        3 - Size of log
        4 - Error code in the case of x_GET_STATEINFO or x_CLEAR_STATEINFO
    AMD64 Processors
        1 - Bank number
        2 - Address of MCA_EXCEPTION structure
        3 - High 32 bits of MCi_STATUS MSR for the MCA bank that had the error
        4 - Low  32 bits of MCi_STATUS MSR for the MCA bank that had the error
Arguments:
Arg1: 00000000
Arg2: bab3c050
Arg3: b2000040
Arg4: 00000800

Debugging Details:
------------------

   NOTE:  This is a hardware error.  This error was reported by the CPU
   via Interrupt 18.  This analysis will provide more information about
   the specific error.  Please contact the manufacturer for additional
   information about this error and troubleshooting assistance.

   This error is documented in the following publication:

      - IA-32 Intel(r) Architecture Software Developer's Manual
        Volume 3: System Programming Guide

   Bit Mask:

       MA                           Model Specific       MCA
    O  ID      Other Information      Error Code     Error Code
   VV  SDP ___________|____________ _______|_______ _______|______
   AEUECRC|                        |               |              |
   LRCNVVC|                        |               |              |
   ^^^^^^^|                        |               |              |
      6         5         4         3         2         1
   3210987654321098765432109876543210987654321098765432109876543210
   ----------------------------------------------------------------
   1011001000000000000000000100000000000000000000000000100000000000


VAL   - MCi_STATUS register is valid
        Indicates that the information contained within the IA32_MCi_STATUS
        register is valid.  When this flag is set, the processor follows the
        rules given for the OVER flag in the IA32_MCi_STATUS register when
        overwriting previously valid entries.  The processor sets the VAL
        flag and software is responsible for clearing it.

UC    - Error Uncorrected
        Indicates that the processor did not or was not able to correct the
        error condition.  When clear, this flag indicates that the processor
        was able to correct the error condition.

EN    - Error Enabled
        Indicates that the error was enabled by the associated EEj bit of the
        IA32_MCi_CTL register.

PCC   - Processor Context Corrupt
        Indicates that the state of the processor might have been corrupted
        by the error condition detected and that reliable restarting of the
        processor may not be possible.

BUSCONNERR - Bus and Interconnect Error   BUS{LL}_{PP}_{RRRR}_{II}_{T}_err
        These errors match the format 0000 1PPT RRRR IILL



   Concatenated Error Code:
   --------------------------
   _VAL_UC_EN_PCC_BUSCONNERR_0

   This error code can be reported back to the manufacturer.
   They may be able to provide additional information based upon
   this error.  All questions regarding STOP 0x9C should be
   directed to the hardware manufacturer.

BUGCHECK_STR:  0x9C_GenuineIntel

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  DRIVER_FAULT

PROCESS_NAME:  Idle

LAST_CONTROL_TRANSFER:  from 806e7bff to 804f9deb

STACK_TEXT:  
bab3c028 806e7bff 0000009c 00000000 bab3c050 nt!KeBugCheckEx+0x1b
bab3c154 806e2c52 bab38d70 00000000 00000000 hal!HalpMcaExceptionHandler+0xdd
bab3c154 baa0a062 bab38d70 00000000 00000000 hal!HalpMcaExceptionHandlerWrapper+0x4a
bacd3d50 80544f8c 00000000 0000000e 00000000 intelppm!AcpiC1Idle+0x12
bacd3d54 00000000 0000000e 00000000 00000000 nt!KiIdleLoop+0x10


STACK_COMMAND:  kb

FOLLOWUP_IP:
intelppm!AcpiC1Idle+12
baa0a062 6a00            push    0

SYMBOL_STACK_INDEX:  3

SYMBOL_NAME:  intelppm!AcpiC1Idle+12

FOLLOWUP_NAME:  MachineOwner

MODULE_NAME: intelppm

IMAGE_NAME:  intelppm.sys

DEBUG_FLR_IMAGE_TIMESTAMP:  41107b37

FAILURE_BUCKET_ID:  0x9C_GenuineIntel_intelppm!AcpiC1Idle+12

BUCKET_ID:  0x9C_GenuineIntel_intelppm!AcpiC1Idle+12

Followup: MachineOwner


Do you have any idea where this is comming from ?