=========================
Problem:
=========================
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: 5e044688, memory referenced
Arg2: 00000002, IRQL
Arg3: 00000000, value 0 = read operation, 1 = write operation
Arg4: f6e74367, address which referenced memory
=========================
Recommendations:
=========================
NVENET.SYS is trying to dereference a bogus memory address.  The memory address may have been valid at one point, but then either freed prior to referencing, or corrupted by another driver running on the system. I can't tell how it got that way with a minidump (not enough info) but it is a constant factor in all of the mini dumps you have.   If it was a different driver referenced in each dump, I would suspect a driver is corrupting memory, but this is the same driver each time, so it's likely this is our culprit.
This is a driver provided by nForce  The version you have installed is from 2002.   I would suggest updating this driver.
=========================
Analysis:
=========================
kd> !analyze -v
*******************************************************************************
*                                                                             *
*                        Bugcheck Analysis                                    *
*                                                                             *
*******************************************************************************
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: 5e044688, memory referenced
Arg2: 00000002, IRQL
Arg3: 00000000, value 0 = read operation, 1 = write operation
Arg4: f6e74367, address which referenced memory
Debugging Details:
------------------
Debugger Dbgportaldb Connection::Open failed 80004005
Database Dbgportaldb not connected
ADO ERROR 80004005,11: [DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.
READ_ADDRESS:  5e044688 
CURRENT_IRQL:  2
FAULTING_IP: 
NVENET+6367
f6e74367 8b08             mov     ecx,[eax]
CUSTOMER_CRASH_COUNT:  1
DEFAULT_BUCKET_ID:  DRIVER_FAULT
BUGCHECK_STR:  0xD1
LAST_CONTROL_TRANSFER:  from f6e6fcdc to f6e74367
TRAP_FRAME:  f78a6f0c -- (.trap fffffffff78a6f0c)
ErrCode = 00000000
eax=5e044688 ebx=83f17234 ecx=f72cb65e edx=5e044688 esi=83f17000 edi=83e8e000
eip=f6e74367 esp=f78a6f80 ebp=f78a6fa4 iopl=0         nv up ei ng nz na pe nc
cs=0008  ss=0010  ds=0023  es=0023  fs=0030  gs=0000             efl=00010282
NVENET+0x6367:
f6e74367 8b08             mov     ecx,[eax]         ds:0023:5e044688=????????
Resetting default scope
STACK_TEXT:  
WARNING: Stack unwind information not available. Following frames may be wrong.
f78a6fa4 f6e6fcdc 83e8e000 84cb76e8 83f171e0 NVENET+0x6367
83e8e010 00000000 00000000 00000000 00000000 NVENET+0x1cdc
FOLLOWUP_IP: 
NVENET+6367
f6e74367 8b08             mov     ecx,[eax]
SYMBOL_STACK_INDEX:  0
FOLLOWUP_NAME:  nforce
SYMBOL_NAME:  NVENET+6367
MODULE_NAME:  NVENET
IMAGE_NAME:  NVENET.sys
DEBUG_FLR_IMAGE_TIMESTAMP:  3de59761
STACK_COMMAND:  .trap fffffffff78a6f0c ; kb
BUCKET_ID:  0xD1_NVENET+6367
Followup: nforce
kd> .trap fffffffff78a6f0c
ErrCode = 00000000
eax=5e044688 ebx=83f17234 ecx=f72cb65e edx=5e044688 esi=83f17000 edi=83e8e000
eip=f6e74367 esp=f78a6f80 ebp=f78a6fa4 iopl=0         nv up ei ng nz na pe nc
cs=0008  ss=0010  ds=0023  es=0023  fs=0030  gs=0000             efl=00010282
NVENET+0x6367:
f6e74367 8b08             mov     ecx,[eax]         ds:0023:5e044688=????????
kd> kv
  *** Stack trace for last set context - .thread/.cxr resets it
ChildEBP RetAddr  Args to Child              
WARNING: Stack unwind information not available. Following frames may be wrong.
f78a6fa4 f6e6fcdc 83e8e000 84cb76e8 83f171e0 NVENET+0x6367
83e8e010 00000000 00000000 00000000 00000000 NVENET+0x1cdc
kd> dd eax
5e044688  ???????? ???????? ???????? ????????
5e044698  ???????? ???????? ???????? ????????
5e0446a8  ???????? ???????? ???????? ????????
5e0446b8  ???????? ???????? ???????? ????????
5e0446c8  ???????? ???????? ???????? ????????
5e0446d8  ???????? ???????? ???????? ????????
5e0446e8  ???????? ???????? ???????? ????????
5e0446f8  ???????? ???????? ???????? ????????
kd> !pool eax
Pool page 5e044688 region is Unknown
GetUlongFromAddress: unable to read from 805479d0
5e044000 is not a valid small pool allocation, checking large pool...
unable to get pool big page table - either wrong symbols or pool tagging is disabled
5e044000 is freed (or corrupt) pool
Bad allocation size @5e044000, too large
***
*** An error (or corruption) in the pool was detected;
*** Pool Region unknown (0x5E044000)
***
*** Use !poolval 5e044000 for more details.
***
kd> !poolval 5e044000
Pool page 5e044000 region is Unknown
Validating Pool headers for pool page: 5e044000
Pool page [ 5e044000 ] is INVALID.
kd> lmvm NVENET
start    end        module name
f6e6e000 f6e81c00   NVENET   T (no symbols)           
    Loaded symbol image file: NVENET.sys
    Image path: NVENET.sys
    Image name: NVENET.sys
    Timestamp:        Wed Nov 27 20:11:13 2002 (3DE59761)
    CheckSum:         00014996
    ImageSize:        00013C00
    Translations:     0000.04b0 0000.04e0 0409.04b0 0409.04e0