Windows professional. By the way, I tried to press the delete button when boot screen, and I'm just stuck at this (please see sceenshot)
http://tinypic.com/r/2rly8ex/8
Yeah I'm sure I insert it right. I also tried a inserting single stick, it finish the boot but the blue screen popped when Windows is loading. My current OS is windows 7 64 bit
I bought a two new Corsiar Vengeance DDR3 1600Mhz 1.50V 9-9-9-24 and installed in my motherboard MSI h55M-E23(MS-7636).
When I open my pc, It just freeze on boot screen and it won't go. My RAM had just two slots. My old ram is just 2GB. Thanks.