Laptop shuts down

[JolienSims]

Hello, I've got a problem with playing the Sims 3.
Problem is, that whenever the loading screen finishes, my laptop blacks out and restarts. I've also once got a graphical glitch when I restarted doing that.

I've updated my graphic card, and checked on a site if my system requirements are okay, which are good.
The laptop was recently repaired for its malfuctioning graphic card though, but when I start up Zoo Tycoon 2, that game does work, so I think the problem may be exclusive to the Sims 3. Another possible but unlikely cause may be that I only have 500 MB of space on my C: disk, I did install the game on my D: disk though ( which has plenty of space ), but the game does say that there may be too little space. On a side note, how do I get the Sims 3, if it works at  least, to save and do all its stuff on my D: disk?

I've skimmed over the other topics but found no advice.

Anybody got any advice?