URGENT - Driver IRQL not less or equal BSODs [100000d1] caused by rasl2tp.sys?

Dear Friends,

My IBM ThinkPad Z60m laptop began to display random DRIVER_IRQL_NOT_LESS_OR_EQUAL BSODs a few days ago, which identify the culprit as rasl2tp.sys (rasl2tp!FreeBufferToPool+35).

Unfortunately, I'm not sure what to do with this information after trying the following with no success:

(1) I ran complete diagnostics on the hardware using various tools (memtest, mhdd, pc check, etc.), and found no problems.
(2) All device drivers are up-to-date, and the computer is clean of viruses, spyware and other malware.
(3) No significant software changes were made recently; the computer was working properly until a few days ago.
(4) Windows XP is completely updated as for today.

Can anyone shed some light on this and help me solve this annoying problem? (see minidumps attached).

Bugcheck Analysis (summary)
DRIVER_IRQL_NOT_LESS_OR_EQUAL (d1)
An attempt was made to access a pageable (or completely invalid) address at an
interrupt request level (IRQL) that is too high. This is usually
caused by drivers using improper addresses.
If kernel debugger is available get stack backtrace.
Arguments:
Arg1: 00000004, memory referenced
Arg2: 00000002, IRQL
Arg3: 00000001, value 0 = read operation, 1 = write operation
Arg4: f8585c43, address which referenced memory
Debugging Details:
------------------
WRITE_ADDRESS: 00000004
CURRENT_IRQL: 2
FAULTING_IP:
rasl2tp!FreeBufferToPool+35
f8585c43 897104 mov dword ptr [ecx+4],esi
CUSTOMER_CRASH_COUNT: 1
DEFAULT_BUCKET_ID: DRIVER_FAULT
BUGCHECK_STR: 0xD1
PROCESS_NAME: System
LAST_CONTROL_TRANSFER: from f8589402 to f8585c43
STACK_TEXT:
f88c3c0c f8589402 fce1a198 82283c80 00000001 rasl2tp!FreeBufferToPool+0x35
f88c3c2c f81a587f 81e4abf0 827fb940 81e08048 rasl2tp!LmpReturnPacket+0x52
f88c3c54 f75cec2e 81e08048 00000001 82880eb0 NDIS!NdisReturnPackets+0xe9
f88c3c6c f75cfbb5 81e08008 f88c3ca0 f81a587f ndiswan!NdisWanFreeRecvDesc+0x1b
f88c3c78 f81a587f 825372a8 82880eb0 82880eb0 ndiswan!MPReturnPacket+0x10
f88c3ca0 f75bb061 f88c3cc4 00000001 f75bb026 NDIS!NdisReturnPackets+0xe9
f88c3cb8 f81a587f 82536698 82880eb0 823012c0 psched!MpReturnPacket+0x3b
f88c3ce0 aa42f875 829f1ae8 00000001 823012c0 NDIS!NdisReturnPackets+0xe9
f88c3cf8 aa433d39 823012c0 00000000 aa433d39 afd!AfdReturnBuffer+0xe1
f88c3d1c aa426a06 82301290 82301308 82301290 afd!AfdFreeNPConnectionResources+0x58
f88c3d34 aa4269aa 82301290 aa4257a8 f88c3d60 afd!AfdFreeConnectionResources+0x41
f88c3d44 aa42386a 82301308 826921c8 82669030 afd!AfdFreeConnection+0x5c
f88c3d60 8056b0b5 82669030 00000000 8055a65c afd!AfdDoWork+0x51
f88c3d74 8053418a 826921c8 00000000 82bc8b30 nt!IopProcessWorkItem+0x13
f88c3dac 805c5072 826921c8 00000000 00000000 nt!ExpWorkerThread+0x100
f88c3ddc 80541362 8053408a 00000001 00000000 nt!PspSystemThreadStartup+0x34
00000000 00000000 00000000 00000000 00000000 nt!KiThreadStartup+0x16
STACK_COMMAND: kb
FOLLOWUP_IP:
rasl2tp!FreeBufferToPool+35
f8585c43 897104 mov dword ptr [ecx+4],esi
SYMBOL_STACK_INDEX: 0
SYMBOL_NAME: rasl2tp!FreeBufferToPool+35
FOLLOWUP_NAME: MachineOwner
MODULE_NAME: rasl2tp
IMAGE_NAME: rasl2tp.sys
DEBUG_FLR_IMAGE_TIMESTAMP: 41107ebd
FAILURE_BUCKET_ID: 0xD1_W_rasl2tp!FreeBufferToPool+35
BUCKET_ID: 0xD1_W_rasl2tp!FreeBufferToPool+35
Followup: MachineOwner

Computer Configuration (summary)
Computer Type: ACPI Uniprocessor PC (Mobile)
Operating System: Microsoft Windows XP Home Edition
OS Service Pack: Service Pack 2
Internet Explorer: 7.0.5730.11 (IE 7.0)
DirectX: 4.09.00.0904 (DirectX 9.0c)
CPU Type: Mobile Intel Celeron M 370, 1500 MHz (15 x 100)
Motherboard Name: IBM ThinkPad Z60m
Motherboard Chipset: Mobile Intel Alviso-G i915GM
System Memory: 502 MB
BIOS Type: Phoenix (11/19/05)
Video Adapter: Mobile Intel(R) 915GM/GMS,910GML Express Chipset Family (128 MB)
3D Accelerator: Intel GMA 900
Monitor: IBM ThinkPad 1280x800
Audio Adapter: Analog Devices AD1981HD @ Intel 82801FBM ICH6-M - High Definition Audio Controller [B-1]
IDE Controller: Intel(R) 82801FBM Ultra ATA Storage Controllers - 2653
IDE Controller: Ricoh Memory Stick Host Controller
IDE Controller: Ricoh SD Bus Host Adapter
Storage Controller: ST3SHARK SCSI Controller
Disk Drive: TOSHIBA MK4032GSX (40 GB, 5400 RPM, SATA)
Optical Drive: Generic DVD-ROM SCSI CdRom Device
Optical Drive: HL-DT-ST RW/DVD GCC-4244N (DVD:8x, CD:24x/24x/24x DVD-ROM/CD-RW)
Network Adapter: Broadcom NetXtreme Gigabit Ethernet
Modem: ThinkPad Modem

Installed Software (summary)
AC3Filter (remove only)
Access Help
ACDSee 8
Ad-Aware 2007
Adobe Flash Player ActiveX
Adobe Photoshop CS
Adobe Reader 7.0
Adobe Shockwave Player
AudioPlugin.dll
Barak013 L2TP
bodyways Toolbar
Branding
CCleaner (remove only)
CopyNow.dll
DAEMON Tools
DataPlugin.dll
Diskeeper Lite
DLA
dlatray.exe
EPSON Printer Software
Gaim (remove only)
Gemmico FolderInfo 2.24
Google Gmail Notifier
Google Toolbar for Internet Explorer
Google Toolbar for Internet Explorer
GoToMeeting/GoToWebinar 3.0.0.198
GTK+ Runtime 2.6.9 rev a (remove only)
Help Center
HighMAT Extension to Microsoft Windows XP CD Writing Wizard
HijackThis 1.99.1
Hotfix for Windows Media Format SDK (KB902344)
IBM 32-bit Runtime Environment for Java 2, v1.4.2
ICQ 5.1
ICQ Toolbar
Intel(R) Graphics Media Accelerator Driver
Intel(R) Graphics Media Accelerator Driver for Mobile
Intel(R) PROSet/Wireless Software
interproMonitor
InterVideo WinDVD
Israel_Radio Toolbar
iTunes
J2SE Runtime Environment 5.0 Update 6
LiveReg (Symantec Corporation)
Logitech SetPoint
Macromedia Dreamweaver 8
Macromedia Extension Manager
Macromedia Flash MX
Macromedia Flash Player 8 Plugin
MatrixMixer (remove only)
Maxthon Browser (remove only)
mCore
mDriver
Message Center
Microsoft .NET Framework 1.1
Microsoft .NET Framework 1.1
Microsoft .NET Framework 1.1 Hotfix (KB928366)
Microsoft .NET Framework 2.0
Microsoft Interactive Training
Microsoft Internationalized Domain Names Mitigation APIs
Microsoft National Language Support Downlevel APIs
Microsoft Office XP English User Interface Pack
Microsoft Office XP Professional òí FrontPage
Minolta DiMAGE Scan Dual3 ver 1.0
mIRC
mMHouse
Mozilla Firefox (1.5)
mPfMgr
mProSafe
MSN
MSXML 4.0 SP2 (KB927978)
MSXML 4.0 SP2 (KB936181)
mWlsSafe
mXML
Nero 6 Ultra Edition
No-IP.com DUC (remove only)
NOD32 Antivirus System
Nokia Connectivity Cable Driver
Nokia PC Suite
Nokia PC Suite
Norton Security Scan
PC Connectivity Solution
PC-Doctor for Windows
PCHealth
PowerDVD
Productivity Center Supplement for ThinkPad
QuickTime
Radio Israel Toolbar
RecordNow Audio
RecordNow Copy
RecordNow Data
Rescue and Recovery - Client Security Solution
Security Update for CAPICOM (KB931906)
Security Update for Step By Step Interactive Training (KB923723)
Security Update for Windows Media Player (KB911564)
Security Update for Windows Media Player 10 (KB911565)
Security Update for Windows Media Player 10 (KB917734)
Security Update for Windows Media Player 10 (KB936782)
Shockwave
Skype 2.5
Software Installer
Sonic Express Labeler
Sonic Update Manager
SoulSeek Client 156c
SoundMAX
Super Mail Sender
System Migration Assistant 5.0
ThinkPad Configuration
ThinkPad EasyEject Utility
ThinkPad FullScreen Magnifier
ThinkPad Keyboard Customizer Utility
ThinkPad Modem
ThinkPad PC Card Power Policy
ThinkPad Power Management Driver
ThinkPad Power Manager
ThinkPad Presentation Director
ThinkPad UltraNav Driver
ThinkPad UltraNav Wizard
ThinkVantage Access Connections
ThinkVantage Active Protection System
ThinkVantage Away Manager
ThinkVantage Productivity Center
ThinkVantage Technologies Welcome Message
TrackPoint Accessibility Features
UltraVNC v1.0.1
Video Converter 3
Wallpapers
Winamp (remove only)
Windows Driver Package - Nokia (WUDFRd) WPD (06/01/2007 6.84.33.0)
Windows Driver Package - Nokia Modem (02/15/2007 3.1)
Windows Driver Package - Nokia Modem (02/15/2007 3.1)
Windows Driver Package - Nokia Modem (05/24/2007 6.84.0.1)
Windows Installer 3.1 (KB893803)
Windows Internet Explorer 7
Windows Live Messenger
Windows Live Sign-in Assistant
Windows Media Connect
Windows Media Connect
Windows Media Format Runtime
Windows Media Hotfix - KB895181
Windows Media Player 10
Windows Media Player 10 Hotfix - KB888656
Windows Media Player 10 Hotfix - KB892313
Windows XP Hotfix - KB885222
Windows XP Hotfix - KB885884
Windows XP Hotfix - KB886677
Windows XP Hotfix - KB887472
Windows XP Hotfix - KB887742
Windows XP Hotfix - KB887797
Windows XP Hotfix - KB888240
WinRAR archiver
WinZip
WordWeb
XP Themes
XviD 1.1 final uninstall
Yahoo! Toolbar

__

Thanks in advance,
Chen

rasl2tp.sys is a core Windows File. I suggest running ChkDsk and you may possibly need to do an OS repair. If you don't have a recovery disk I would contact Lenovo promptly and tell them of your issue. Thinkpads are their higher-end laptops. Hopefully it is still under warrenty.

Last time I had that error, it was Memory Related.

(Driver IRQL not less or equal )