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It is most likely the power supply.
Correct, or motherboard, look for leaking transistors on the board. Pretty easy to spot, if you see any of the larger cylinder shaped thingys on you board (there should be plenty of them) leaking orage goo then your motherboard is at fault.
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If it was the RAM, it would certaintly not restart.
Not true, you'll find that RAM errors will indeed cause a restart. It's not beyond the realms of possibility that you have bodgy RAM. Just less likely than PSU and Motherboard. Test it with
THIS.
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If it was the CPU, it would crash the system. It would not restart.
Same scenario as RAM, the system will restart all by itself sometimes.
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Please be a bit more careful with advice like that Bagira, I've been working on PC maintenence for 3+ years now, and some of that stuff is just not that true.
-Bad CPU's, RAM, motherboards, and Hard Disks will cause programs to crash and windows to restart itself frequently. %99 of systems with these problems exhibit symptoms where they DO NOT HANG, progams just crash or the machine gets re-booted cold. The only way to tell which part is faulty is by trial and error.
Seeing as you can't really test the motherboard (except by looking at it) you have to test HDD, CPU and RAM to make sure they are OK before you can reach any conclusion. That beiong said one of the first things we do to badly behaving machines is try the test power supply in them. It's an easy thing to test and doesn't take much time.
-Bad PSU's usually just shut off, or refuse to power up properly or at all. You may get the occasional restart.
-Bad graphics cards are usually recognisable by on screen artifacts initially or in game system hangs.
Hope all that clears a few things up.