[Solved] Lock up issue

hello all i need some serious help i recently built my
first pc last month and i have been having
a issue with my pc locking up but it does not lock up
at random times. but when i play a game or
trying to burn a DVD.... i can burn CD's with no
problem and also when i try and watch a blu ray
movie it locks up... when im watching a regular DVD I
have no problem. i can leave the pc running all
day long and surf the internet and it will not lock up at
all these is the hardware from my PC
everything is new except for the hard drive i got it from
a co-worker, but the hard drive was still
wrapped up and was never open. But now it's starting to lock up at random now
power supply:ultra X3 850w
DVD player: lite on 6X blu ray
ultra usb 2.0 md3 5.25 multi function panel
case: ultra m998 mid tower
ram: OZC reaper 4096MB pc10666 ddr3 1333Mhz
(2x2048)
motherboard:evga nForce 790i ultra SLI socket 775
CPU:intel core 2 quad Q9650 3ghz 12mb 1333 fsb cpu
video card:bfg geforce gtx 285 oc 1gb PCIe b edition
HArd drive:seagate barracuda 1tb 32 mb sata hd
operating system: windows vista ultimate 32-bit
any advice would be helpful. thanks all in advance

It didn't show up but 45 min in the test my pc had locked up didn't really finsh the test

But in the process of the test my CPU temps got up 64c and my ram was at 3.2gb
after the 8k test it locked up... I have the data for the test on my email address but I guess it didn't submit it correctly on the fourm

Ok just ran the test with one stick a ram the first was fine no problem... Some with the second stuck of ram except for when i was about to ran the test the pc locked up but the second time there was no problem... CPU temps was 61c at the highest for both