What does 0x0000008E , 0xC0000005, 0xF7549590, 0xE006871C, 0x00000000?

i have had steam for a few weeks now 3 days ago it worked fine but yesterday and today when i logon into my account i get the BSOD saying "A Problem has been decected and windows has been shut down to prevent harm to your computer" then the code then atapi.sys address F753f0000 dateStamp 411076 please help i wanna know whats wrong with steam becuase i just bout a new game and i dont wanna have bought it for nothing :(