My Computer kept freezing, I just have a hard drive failure 1 week ago, so I changed to a new Hard drive Seagate barracuda 1 TB 7200 32 MB. But then problem still persist, So I thought Power Supply is wrong, because I also added 2 GB DDR2 Memory RAM of the same type as the other 2 GB DDR2 memory RAM so I have 4 x 1GB DDR2 memory Ram Corsair now, they are all the same brand. But even until now My computer are still freezing up, especially when something really heavy is going on in the computer, like when the computer is using 70- 90 % of the computer to do something. My other spec is P5NE-SLI, NVIDIA GeFORCE 9600 GSO 768 MB, NVIDIA GEFORCE 8600 GT 256 MB, Processor Intel Core DUO 3.0 GHZ. I changed from Vista 64 bit to Windows 7 and still no luck, I dont need to kept wasting my money If I know the source, so please help thanks.