What makes laptop to show a blue srean error

Hello,
my laptop(toshiba satellite with windows 7) just started giving me this screen
I keep getting this blue screen error. Can anyone tell me how to fix it?

A PROBLEM HAS BEEN DETECTED AND WINDOWS HAS BEEN SHUT DOWN TO PREVENT DAMAGE TO YOUR COMPUTER.
A PROCESS OR THREAD KERNEL CRUCIAL TO THE SYSTEM OPERATION HAS UNEXPECTEDLY EXITED OR BEEN TERMINATED.
IF THIS IS THE FIRST TIME YOU HAVE SEEN THIS, RESTART, IF IT APPEARS AGAIN FOLLOW THESE STEPS:
CHECK NEW H/W OR S/W, ENSURE THEY HAVE BEEN PROPERLY INSTALLED, DISABLE OR REMOVE H/W OR S/W IF PROBLEM CONTINUES. DISABLE BIOS MEMORY OPTIONS SUCH AS CACHING OR SHADOWING.
IF YOU NEED TO USE SAFE MODE TO REMOVE OR DISABLE COMPONENTS, RESTART COMPUTER, PRESS F8 TO SELECT ADVANCE START UP OPTIONS AND THEN SELECT SAFE MODE.
ERROR MESSAGE:

xxxSTOP: 0x000000f4(0×00000003,0×80604528)

BEGINNING DUMP OF PHYSICAL MEMORY.
PHYSICAL MEMORY DUMP COMPLETE.
CONTACT YOUR SYSTEM ADMINISTRATOR OR TECH SUPPORT FOR ASSISTANCE IF THE PROBLEM CONTINUES.
pls can any one help me pls