BSOD-SYSTEM_SERVICE_EXCEPTION 0x0000003b

Hello all, any help woul dbe greatly appreciated:

1- I dowloaded and installed the windows (GUI) debug tool WinDBG, and downloaded and installed the symbols, but am unable to load the symbols into debug as i do not know which sub-directory to load (MSoft is SOOO helpful with this).

2- BSOD - seems to go away in safe mode. Was intermittent a few weeks ago, now is every 5 mins or so, if not quicker.
Have attached requisite collected info per BSOD posting rules. Also listing Blueview info:
SYSTEM_SERVICE_EXCEPTION
bug check code: 0x0000003b
crash address: ntoskrnl.exe+7cc40
caused by driver: mrxsmb20.sys

Compaq CQ60, 1.5 years old. 2 g ram, intel celeron 900 @2.2 ghz, 2.19 ghz
64 windows bit home premium - OEM

Thank you for your reply. I uninstalled IObit. Is that an educated guess on your part, or is it based on the attached reporting? (BTW- after it ran ok in safe mode, i took a chance and reseumed normal mode, and have not gotten a BSOD all morning, bucking the trend. I have now uninstalled IObit).

Probably should have looked at the dumps before posting, but I spent so long screwing around with WinDBG i had lost patience. (Plus I have a very imp trial starting tomorrow so im a bit frazzled). GREATLY appreciate your help.