Blue screen 0x0000004e and 0x0000001e with new build

[Astern]

Hey, I built a new computer last week and it seemed fine but now it's blue screening. Once was when I was playing a game and the other was today when i was just browsing the web. I am not sure where to check dump files and what not, I'm using a bluescreen viewer program. The OS I am using is a cracked copy Windows 7 64bit. I've noticed that I can't really download updates properly, Steam crashes, Chrome crashes. No idea what to do. Some help would be great..

ntoskrnl.exe+71f00 one crash address
ntoskrnl.exe+75c00 another crash address.

 

[Astern]

Quick update: I've installed all important and recommend windows updates (About 43 of them) Uninstalled Chrome and Steam. Now using Fire Fox and I am running a Virus scan. If I get another Blue screen should I re-install my OS (Will getting a Genuine copy help?) Or review my hardware. The only new hardware I've gotten since building is a head set. I've updated my BIOS as well..