Norton AntiVirus 10.0 Mac caused kernel panic crash

hello,

this afternoon i came back to my machine and saw the leopard crash mesage on my screen. when i restarted the crash reporter had this information:

Tue Dec  2 15:22:32 2008
panic(cpu 2 caller 0x003627C3): "kauth_cred_ref: trying to take a reference on a cred with no references"@/SourceCache/xnu/xnu-1228.7.58/bsd/kern/kern_credential.c:3497
Backtrace (CPU 2), Frame : Return Address (4 potential args on stack)
0x54def928 : 0x12b0fa (0x459234 0x54def95c 0x133243 0x0)
0x54def978 : 0x3627c3 (0x48c33c 0x0 0x14 0x0)
0x54def998 : 0x38295b (0x724dc50 0x1 0x246 0x5c2c89ed)
0x54defa58 : 0x383bdc (0x80814000 0x0 0x54deff5c 0x724c9d0)
0x54defec8 : 0x380fa0 (0x54deff28 0x2 0x80814000 0x0)
0x54deff78 : 0x3ddd6e (0x724c9d0 0x776d040 0x776d084 0x0)
0x54deffc8 : 0x19f3b3 (0x753bfc0 0x0 0x1a20b5 0x79ef8b8)
No mapping exists for frame pointer
Backtrace terminated-invalid frame pointer 0xb019edc8

BSD process name corresponding to current thread: NortonAutoProte

Mac OS version:
9F33

Kernel version:
Darwin Kernel Version 9.5.0: Wed Sep  3 11:29:43 PDT 2008; root:xnu-1228.7.58~1/RELEASE_I386
System model name: MacPro1,1 (Mac-F4208DC8)

System properties tab:

Model: MacPro1,1, BootROM MP11.005C.B08, 4 processors, Dual-Core Intel Xeon, 2.66 GHz, 4 GB
Graphics: kHW_ATIr580Item, ATY,RadeonX1900, spdisplays_pcie_device, 512 MB
Memory Module: DIMM Riser A/DIMM 1, 512 MB, DDR2 FB-DIMM, 667 MHz
Memory Module: DIMM Riser A/DIMM 2, 512 MB, DDR2 FB-DIMM, 667 MHz
Memory Module: DIMM Riser B/DIMM 1, 512 MB, DDR2 FB-DIMM, 667 MHz
Memory Module: DIMM Riser B/DIMM 2, 512 MB, DDR2 FB-DIMM, 667 MHz
Memory Module: DIMM Riser A/DIMM 3, 512 MB, DDR2 FB-DIMM, 667 MHz
Memory Module: DIMM Riser A/DIMM 4, 512 MB, DDR2 FB-DIMM, 667 MHz
Memory Module: DIMM Riser B/DIMM 3, 512 MB, DDR2 FB-DIMM, 667 MHz
Memory Module: DIMM Riser B/DIMM 4, 512 MB, DDR2 FB-DIMM, 667 MHz
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x87), Broadcom BCM43xx 1.0 (5.10.38.9)
Bluetooth: Version 2.1.0f17, 2 service, 1 devices, 1 incoming serial ports
Network Service: Built-in Ethernet 2, Ethernet, en1
PCI Card: ATY,RadeonX1900, display, Slot-1
Serial ATA Device: WDC WD3200KS-00PFB0, 298.09 GB
Serial ATA Device: WDC WD2500AAJS-41RYA0, 232.89 GB
Serial ATA Device: WDC WD4000AAKS-00TMA0, 372.61 GB
Serial ATA Device: WDC WD4000AAKS-00TMA0, 372.61 GB
Parallel ATA Device: OPTIARC DVD RW AD-7170A
USB Device: Bluetooth USB Host Controller, Apple, Inc., full_speed, 500 mA
USB Device: Hub in Apple Extended USB Keyboard, Mitsumi Electric, full_speed, 500 mA
USB Device: USB-PS/2 Optical Mouse, Logitech, low_speed, 100 mA
USB Device: Apple Extended USB Keyboard, Mitsumi Electric, full_speed, 250 mA
FireWire Device: built-in_hub, unknown_value, unknown_speed

i was not running an active scan @ the time but norton runs in the background all the time. this is the second day for me running norton and the first crash.