Reboot & blue screen!

Question

Last night, I played sims 3 for the first time & after a while, after my sims were watching TV (i don't know if it's important or not), but after that, the screen flickered & went black & kept showing the game, and then it din't & finally it rebooted.
I checked the system requirements onsystemrequirementslab and it said My CPU can't handle it at all. This is what it said.
CPU
Minimum: (XP) 2.0 GHz P4 processor or equivalent; (Vista) 2.4 GHz P4 processor or equivalent [If built-in graphics chipsets then 2.6 GHz Pentium D CPU, or 1.8 GHz Core 2 Duo, or equivalent].
You Have: Intel(R) Celeron(R) CPU 450 @ 2.20GHz
CPU Speed
Minimum: (XP) 2.0 GHz P4 processor or equivalent; (Vista) 2.4 GHz P4 processor or equivalent [If built-in graphics chipsets then 2.6 GHz Pentium D CPU, or 1.8 GHz Core 2 Duo, or equivalent.]You Have: 2.19 GHz
I've been wondering what that means.
1st question: Could anyone please tell me what all that gibberish means?
Like, explain it to me. Like, what's a chipset & etc.
2nd question: If I need to buy a new CPU,
Can i just go into best buy & tell them I only need the CPU
or do I have to buy the monitor & speakers & keyboard & mouse as well?
I've been looking at CPU 's and think maybe a  Dell inspiration Desktop w/Intel Core 2 Duo Processing E7400 will be ok?
PLEASE please please help.
 I've been waiting for this game for 5 months & it makes me heartbroken that I might not even be able to play it without making my computer screwed up. ''/

Answer 1

What brand and model is your computer? Looking at what you posted your CPU should not be the issue. But to break down what you posted:
CPU
Minimum if running Windows XP would be 2.0 GHz P4 processor or equivalent
Minimum if running Windows Vista would be 2.4 GHz P4 processor or equivalent
[If built-in graphics chipsets then 2.6 GHz Pentium D CPU, or 1.8 GHz Core 2 Duo, or equivalent]. Some systems ship without a dedicated video card which is what does all the calculations for the game and does the rendering on the screen for you. For systems that ship without this card they use a less effective built-in video card that rather being dedicated to doing nothing but graphics has to share time with your CPU which is why you need a faster CPU when a computer has built in graphics.
You Have: Intel(R) Celeron(R) CPU 450 @ 2.20GHz This is what process you have in your computer at the moment.
CPU SpeedMinimum if running Windows XP would be 2.0 GHz P4 processor or equivalent
Minimum if running Windows Vista would be 2.4 GHz P4 processor or equivalent [If built-in graphics chipsets then 2.6 GHz Pentium D CPU, or 1.8 GHz Core 2 Duo, or equivalent.]
You Have: 2.19 GHz This is doing nothing more then telling you how fast your CPU is running.
 If i had to guess I would say you are running a built in GPU. You would probably be best just upgrading to a dedicated video card.