the wierd part is that with 1 stick i can un pack my large files with no problem , but with 2 sticks i get BSOD when i try to un pack files 
My Computer
At a glance
Windows 7 Ultimate x64Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHzNVIDIA GeForce GTX 460
- OS
- Windows 7 Ultimate x64
- CPU
- Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz
- Motherboard
- MICRO-STAR INTERNATIONAL CO.,LTD......G31M3 V2(MS-7529)
- Graphics Card(s)
- NVIDIA GeForce GTX 460
- Sound Card
- High Definition Audio Device
- Hard Drives
- TOSHIBA MK1246GSX ATA Device
WDC WD5000AAKS-00A7B0 ATA Device