Windows 7 Home Premium Sudden Freezes

On 17 jan, Mon, After a, you know 'pirated' fallout 3, was installed before that day, everything was fine. But when my brothers wanted to play, the laptop suddenly freezes before he choose a wep. We tried everything from moving mouse, pressing random buttons, shift-tab, Ctrl-Alt-Delete, nothing . We off the laptop directly by holding on the on/off button for at least 3 sec and above. After booting it back, everything loads fine, the safe mode thing and run Windows blah blah blah..... its crashes by freezing during the load up ! And I managed to system recover and samething happened after it was done! Instead of on-ing instantly, we left the laptop for a while and turn on, everything went ok until after i logged in. half way, i thought that the 'pirated' game was causing it, I uninstall it but left on the laptop utorent untouched. Then I tried play some other games like GMod from steam, NOT 'PIRATED', everything went fine untill it crashed again halfway playing L4D2. I need help on this prob ASAP.

Sign, CodeLyokoForever9011XD (the 9011 family )

After that, I thought it was the Battery was the caused, I removed the Laptop battery (needs to be replaced since it was overcharged by my stupid forgetful Brothers), I played the Laptop while charging, so I thought that finally the prob is solved and installed 'pirated' fallout out again, half way... IT CRASHED AGAIN! FREEZING EVERYTHING UP LIKE "The creator of Windows 7 hates you!" ARG