Win 7 64bit Ultimate BSOD every day at least

Hi guys do you know what is causing this i have the latest drivers the system is less than a year old & all was working fine until i put Win 7 64bit RC which i installed on the 24th october 2009 & every day since i have had at least one or more BSOD

here is the dump info ( I think)

Problem signature:
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 2057

Additional information about the problem:
BCCode: 7f
BCP1: 0000000000000008
BCP2: 0000000080050031
BCP3: 00000000000006F8
BCP4: FFFFF80002CAF40F
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1

Files that help describe the problem:
C:\Windows\Minidump\102909-36504-01.dmp
C:\Users\JAMES\AppData\Local\Temp\WER-163676-0.sysdata.xml

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C:\Windows\system32\en-US\erofflps.txt

Problem signature
Problem Event Name: BlueScreen
OS Version: 6.1.7600.2.0.0.256.1
Locale ID: 2057

Extra information about the problem
BCCode: 7f
BCP1: 0000000000000008
BCP2: 0000000080050031
BCP3: 00000000000006F8
BCP4: FFFFF80002CAF40F
OS Version: 6_1_7600
Service Pack: 0_0
Product: 256_1
Bucket ID: X64_0x7f_8_NETIO!CompareSecurityContexts+6a
Server information: 5d2c3737-d568-437c-8ab3-07863cceb568


So any ideas what is causing this as im reading so many different things when i google NETIO

Quadcore 9660
Evga 780I FTW Mobo
8GHZ Dominator ram with cooling bridge
3 X xfx9800GTX+black edition's in SLI
1 X WD 250gb sata 2 drive
1 x WD 1TB sata 2
1 x samsung 50gb IDE drive (empty)
loads of cooling 3 x120mm fans 1x 200mm Exahust fan
1 X Zalman coller with a 120mm fan & copper heatsink
1,000 Watt OCZ psu