Crystal WDM Sound card causing Blue Screens

Hi,
I've got a Toshiba Satellite laptop with XP Home and SP2 (which caused no probs at the time of the upgrade nor after). My problem is my sound card, Crystal WDM Audio Codec, is causing Blue Screens of Death (BSOD) if it is activated. If i disable it, my system/laptop is completely stable--without any sound of course!

I've removed and re-installed the sound card countless times, sometimes in normal mode, sometimes in safe mode. I get an immediate BSOD or, on a good day, I get about 45min of sound and then the BSOD.

i've completely deleted all files associated with the sound card (or so i think: cwawdm.sys, drmk.sys, portcls.sys, stream.sys, ksproxy.ax, ksuser.dll, wdmaud.drv) and manually "updated" the driver by choosing the folder with the 3 files (cwawdm.inf, cwawdm.sys, pw4100.cat) on my desktop that came directly from Toshiba's website. i've done the same process but with the standard XP drivers. again, if i'm lucky the sound works for maybe 45 minutes and then blue screens me (see specific error msgs below).

on another website a guy thought it might be a problem with my memory and so i RERAN the Microsoft Windows Memory Diagnostic and let it have 3 passes, all with zero errors.

I've tried restoring my computer to a date way before the issue started, again, to no avail.

what errors I get:
most frequently...
IRQL_NOT_LESS_OR_EQUAL
Stop 0x0000000A (0X805F40F0, 0X00000002, 0X00000000, 0X805F40F0)

as frequent as the first one...
DRIVER_ IRQL_NOT_LESS_OR_EQUAL
Stop 0X000000D1 (0XF934BD68,0X00000002, 0X00000000, 0XF9346AFA)

DRIVER_ IRQL_NOT_LESS_OR_EQUAL
Stop 0X0000000A (0X805F3895, 0X00000002, 0X00000000, 0X805F3895)

only received this twice...
DRIVER_ IRQL_NOT_LESS_OR_EQUAL
Stop 0X000000D1 (0XF3E83310,0X00000002, 0X00000000, 0XF3E83310)
kmixer.sys – address F3E83310 base at F3E71000, Datestamp 41107D32

less frequently than the first 2 error msgs but still, i get it often...
WORKER THREAD RETURNED AT BAD IRQL
Stop 0X000000E1 (0X8056377D, OXOOOOOOOO2, OXFFB1B230, OXFFB1B230)

here are the IRQ setting under System:
all with ISA written next to it…
0=System clock
1=standard keyboard
3=SMC IrCC-Infrared port
6=Diskette controller
8=system clock CMOS/real time
9=compatible system ACPI Microsoft
12=Alps Pointing-device
14=Canal IDE principal
15=Canal IDE secondary
all with PCI written next to it...
9=network card Fast Ethernet PCI Realtek RTL8139 Family
9=Controller CardBus Texas Instruments PCI-1420
9=Controller CardBus Texas Instruments PCI-1420
9=Host Controller PCI on USB universal standard
9=Host Controller PCI on USB universal standard
9=Host Controller PCI on USB universal standard
9=Host Controller Texas Instruments IEEE 1394 compatible OHCI
9=NVIDIA GeForce2 Go
9=Toshiba Semiconductor SM Host Controller
9=Toshiba Software Modem AMR
9=Crystal WDM Audio Codec
10=Controller Intel 82801 CA/CAM SMBus -2483

Please please please help me someone!!!!
thanks!!!