Today I received my 2 4gb ram modules from Crucial, unfortunately windows is being annoying, as usual, and every time I try and run my computer with the new ram, it crashes. I get sent to the windows error recovery screen and it won't go any further than that. I can put the old memory back in and it works fine. I managed to get the new memory in and working fine when I changed the maximum memory limit on windows to 3gb, but that doesn't get me anywhere, other that ruling out the ram being dodgy. And yes, before you ask, the windows os installed is 64-bit. Any ideas?