Why is my new computer lagging so badly?

Whenever I play games, even games like Minecraft with all the graphics options set as low as possible, I still find everything lagging to an extreme. I can't work out why? I have attached a detailed copy of the Windows Experience Index Report. Please help me, I'm so stuck.
Why is my new computer lagging so badly - 1

Added (1). Component Details Subscore Base score
Processor AMD FX(tm)-8320 Eight-Core Processor 7.7
Memory (RAM) 16.0 GB 7.9
Graphics ASUS EAH5450 Series 3.6
Gaming graphics 8438 MB Total available graphics memory 5.8
Primary hard disk 819GB Free (931GB Total) 5.9
Windows 7 Home Premium

I have 8438MB total graphics memory
512mb dedicated graphics
0mb dedicated system
7926MB Shared

Graphic Card: ASUS EAH5450 Series

Your graphics card is killing you. If you are going to game at all you need to spend a minimum of $100 dollars on a graphics card.

Your cpu and memory are both very good.

When you use any graphics with video or games, you must have a strong graphics card. Seems the score on it is very low. I'm having trouble blowing it up to clearly read it, so you might re-post with (or add to this) a better larger snapshot.

It looks like your C drive is partitioned? If it is, this can divide the system in parts where you are using only a "part": of the whole thing, rather than the whole thing. It's ideal not to have it partitioned, but it's hard to tell bc it's so blurry. Which basically means even if the graphics are good enough inside the system, you are only working in part of a whole system. Check this.

Your overall 3.6 score out of 10 isn't good.

You also need to go into my computer & view the percentage used vs available there as well.

It's like a car, if you have a 4 cl engine but wish to race it with the V's, you simply can't. You have to be sure you have a powerful engine overall. So be sure the speed is available with the power & space.

I hate to say it but know a technician, who I asked advice for buying a new system, who warned that I stay far away from an AMD processor. I see this is what you have. Although I believe it's only a problem, if you noticed a bad score there, so it looks fine. Although, if it's "new" as you just mentioned, I would exchange it for one without that AMD.
I'd get one with a great graphics card.

That 3.6 score "determined by the lowest score" is reading the category of your graphics, which is the primary area for gaming, needed to be strong. Telephone Asus to ask about your processor & what they feel is rather needed for properly handling gaming. Ask prices & suggestions on replacing it or returning/exchanging it. Or find out from the store (Costco? Best Buy?) you bought it from. If its new, simply back up & save your stuff, grab the receipt & go exchange it As soon as possible.

I'm seeing lots of video's on how to raise up your score for the Asus graphics card, I would scour through them & see if that helps. I'm seeing there's a method called "overclocking" to improve the performance of the G-card.

Get a new Gfx card. Also, try disabling the fancy Windows Aero theme to pick up a few FPS!

Might need a new RAM
New Processor
New Hard drive
New broadband connection.