Blue screen + crash dump

Hi,
I am experiencing a blue screen error very often and found memory crash
dumps. I am copying the debugger analysis result. Anybody can tell me, is
this hardware or software error. I am using windows xp pro on Acer desktop.

*** WARNING: Unable to verify timestamp for serial.sys


Probably caused by : serial.sys ( serial!SerialGetNextIrpLocked+51 )

Followup: MachineOwner
---------

0: kd> !analyze -v
*******************************************************************************
*
*
* Bugcheck Analysis
*
*
*
*******************************************************************************

IRQL_NOT_LESS_OR_EQUAL (a)
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 a kernel debugger is available get the stack backtrace.
Arguments:
Arg1: 000000e8, memory referenced
Arg2: 00000002, IRQL
Arg3: 00000001, bitfield :
bit 0 : value 0 = read operation, 1 = write operation
bit 3 : value 0 = not an execute operation, 1 = execute operation (only on
chips which support this level of status)
Arg4: 80703a16, address which referenced memory

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




WRITE_ADDRESS: 000000e8

CURRENT_IRQL: 2

FAULTING_IP:
hal!HalCalculateScatterGatherListSize+80
80703a16 8711 xchg edx,dword ptr [ecx]

CUSTOMER_CRASH_COUNT: 1

DEFAULT_BUCKET_ID: INTEL_CPU_MICROCODE_ZERO

BUGCHECK_STR: 0xA

PROCESS_NAME: IEXPLORE.EXE

LAST_CONTROL_TRANSFER: from 804ed4b4 to 80703a16

STACK_TEXT:
fa2c7ed4 804ed4b4 81a4d480 00000000 00000000
hal!HalCalculateScatterGatherListSize+0x80
fa2c7f08 fa053519 81956830 81956768 fa2c7f3c nt!GUID_DOCK_INTERFACE+0x460
fa2c7f18 fa0534d0 81956830 81956814 fa2c7f9c
serial!SerialGetNextIrpLocked+0x51
fa2c7f3c fa056a3d 81956830 81956814 fa2c7f9c serial!SerialGetNextIrp+0x27
fa2c7f68 fa053629 81956830 81956814 fa2c7f9c serial!SerialGetNextWrite+0xf2
fa2c7f90 fa04f073 81956768 00000000 fa04f002
serial!SerialTryToCompleteCurrent+0x7a
fa2c7fcc 804dd26b 81956954 81956768 00000000 serial!SerialCompleteWrite+0x43
fa2c7fe0 451d249d 0401c381 17842a9d 00000000 nt!ZwDuplicateObject+0x7
WARNING: Frame IP not in any known module. Following frames may be wrong.
ffdff980 00000000 fa2c8000 000f1c71 00000000 0x451d249d


STACK_COMMAND: kb

FOLLOWUP_IP:
serial!SerialGetNextIrpLocked+51
fa053519 ?? ???

SYMBOL_STACK_INDEX: 2

SYMBOL_NAME: serial!SerialGetNextIrpLocked+51

FOLLOWUP_NAME: MachineOwner

MODULE_NAME: serial

IMAGE_NAME: serial.sys

DEBUG_FLR_IMAGE_TIMESTAMP: 41107f17

FAILURE_BUCKET_ID: 0xA_W_serial!SerialGetNextIrpLocked+51