You need adequate RAM, a fast enough CPU, and a fast and large enough GPU. Plain. And. Simple.

And that laptop business? Forget it. A game like this will fry it after a while.

You also have to remember, if you're doing stuff like playing music on the computer, or watching YouTube videos, or anything else with sound, you're going to take a huge chunk of your memory away.

Computers are great and all, but they're not built so you can do anything and everything all at the same time with no interruption.

For anyone who's computer is restarting itself, there are only a few reasons in my experience as to why:

1) The CPU is exhausted and overheating -- your MOBO shuts down your PC at this point to keep itself from frying, and potentially catching fire, destroying your machine, blah blah. I have had this happen to someone before on an old Slot 1-A motherboard. Yes, computers can catch fire.

2) The RAM isn't right for your motherboard. You don't need DD5 clocked at 54,000,000 MHZ to play this game. It can be played just fine using DDR2 memory. Besides, if the ram didn't work for your computer, the Motherboard likely wouldn't recognize it and your system probably wouldn't start.

3) Defragging, reformatting, reinstalling, etc., does not help! In fact, it makes things worse. Each time you reinstall the game you're writing to your harddrive disk again, digging deeper into the sectors beneath. Unless this is a Solid State Drive, which I'm sure most of you do not have, regardless of what the box your computer came in, remember that these are physical parts. Touch a HDD after its been on for a while and see if you need to cool your hands down.

Movable parts, that need to be maintained and work well together. Simple rules, right? Most people don't follow them, and they complain its the software's fault. It's not. It's you, or your system.

Get the min specs, and you'll have to play at the min settings.
Get the recommended specs, and you'll be able to play at a okay setting.
Go beyond that, and play to your heart's content at 1080p on three 25" LED screens while you thwart your ability remain focused.

Okay, whatever, I actually don't care.