Multiple Bluescreens.

Hi all. Where to start? I built a custom PC about a year ago now and since then it's been nothing short of catastrophic. I found out I had faulty memory so took it back to the store and had it replaced. Worked fine for a while then started BSOD. I have since installed a new power supply (upgrading from a Corsair 430Watt to a Corsair 550Watt) and a friend gave me a better graphics card (upgraded from a Radeon 7850 to an Nvidia GTX 660) The amount of BSOD I am having is unbearable. 7 in the past 24 hours to be precise. It happens when I am trying to play game, it happens when I could be watching a video on Youtube and it happens when I try to install/uninstall programs. The list is endless. I get everything from IRQL_NOT_EQUAL_OR_LESS to MEMORY MANAGEMENT to A Driver Corrupted Memory Pool and a whole host of other reasons. I have also tested hardware for faults and nothing came up. Can somebody explain to me how to post the results or my event logs and help me out of this mess? I am at the end of my tether.