I've been running Vista x64 for a couple of months now with 4gigs of this memory. I have been wanting to get another 4 and make it 8. So last week i ordered the same thing from newegg. Today I installed them in the empty dual channel slots in my computer. After about 10 minutes of using the computer the screen flips off and opens up a BSOD saying that a system file is missing or corrupt. I can't load the repair disk, and windows won't start without looping on the loading screen or blue screening. Any thoughts? I'm running Memtest86+ right now and have a microsoft memory diagnostic at bat.