Last night I had just installed Sims 3, (old I know but I was bored ok xD) I was playing for about 20mins, then the screen dimmed. I thought it was going in to sleep or something but the charger was plugged in and battery was full as I remember, Keyboard stopped responding, same with the mouse and everything. 
So laptop just sat there blank for about 5 mins but the fan was still running and status lights still on. So I pressed and held the power button and turned it off, waited 30 seconds, turned it back on. 

I was greeted with a screen saying the computer had overheated and shut down blah blah blah and it's the first time I'd seen it. So I just booted as normal, it installed a billion windows updates I'd been avoiding, done a checkdisk, and launched startup repair. Took over half an hour before I could use it so I just went and watched some tv.

Came back, the sims icon was gone from my desktop. Looked in start, wasnt there either. Searched for it. No were to be seen.

Opened iTunes, it gave me an error saying the itunes library file couldn't be found so I just went to music and opened it and sorted that out. But the sims files aren't even in program files anymore.

What could have made it delete that game? I havn't noticed anything else missing.

Cheers in advance.

Sam