Windows 7: BlueScrren bim Herunterfahren

Hi ich/wir haben seit lätzer woche bi einigen Notebooks bluescreens beim Herunterfahren, ansosnsten Arbeiten sie einwandfrei.

die letze Minidump:

"Microsoft (R) Windows Debugger Version 6.12.0002.633 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.


Loading Dump File [C:\Users\briegler\Desktop\031811-25256-01.dmp]
Mini Kernel Dump File: Only registers and stack trace are available

Symbol search path is: C:\Symbols
Executable search path is:
Unable to load image \SystemRoot\system32\ntoskrnl.exe, Win32 error 0n2
*** WARNING: Unable to verify timestamp for ntoskrnl.exe
*** ERROR: Module load completed but symbols could not be loaded for ntoskrnl.exe
Windows 7 Kernel Version 7600 MP (4 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7600.16695.amd64fre.win7_gdr.101026-1503
Machine Name:
Kernel base = 0xfffff800`0304c000 PsLoadedModuleList = 0xfffff800`03289e50
Debug session time: Thu Mar 17 15:02:22.436 2011 (UTC + 1:00)
System Uptime: 0 days 5:19:02.015
Unable to load image \SystemRoot\system32\ntoskrnl.exe, Win32 error 0n2
*** WARNING: Unable to verify timestamp for ntoskrnl.exe
*** ERROR: Module load completed but symbols could not be loaded for ntoskrnl.exe
Loading Kernel Symbols
.

Press ctrl-c (cdb, kd, ntsd) or ctrl-break (windbg) to abort symbol loads that take too long.
Run !sym noisy before .reload to track down problems loading symbols.

..............................................................
................................................................
............................................................
Loading User Symbols
Loading unloaded module list
......
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************

Use !analyze -v to get detailed debugging information.

BugCheck D1, {0, 2, 8, 0}

*** WARNING: Unable to verify timestamp for mssmbios.sys
***** Kernel symbols are WRONG. Please fix symbols to do analysis.


FAULTING_IP:
+3266313839393265
00000000`00000000 ??              ???

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

BUGCHECK_STR:  0xD1

LAST_CONTROL_TRANSFER:  from fffff800030bbca9 to fffff800030bc740

FAILED_INSTRUCTION_ADDRESS:
+3266313839393265
00000000`00000000 ??              ???

STACK_TEXT: 
fffff880`033a0e68 fffff800`030bbca9 : 00000000`0000000a 00000000`00000000 00000000`00000002 00000000`00000008 : nt+0x70740
fffff880`033a0e70 00000000`0000000a : 00000000`00000000 00000000`00000002 00000000`00000008 00000000`00000000 : nt+0x6fca9
fffff880`033a0e78 00000000`00000000 : 00000000`00000002 00000000`00000008 00000000`00000000 fffffa80`0f5f3030 : 0xa


"

Symbole funktionieren nicht  hab schon alle heruntergeladen, aber das ist neben sache,

danke im voraus