Top to bottom, here you go:
Nice logo and search bar placement, very nice actually.
I find it ironic that your site is about assembling computers and yet you have a laptop as your main graphic...? I would personally put a picture of a red Gaming Computer Case there instead to match the color scheme and logo.
The navigation menu and ads on the left are well placed.
The Facebook/Twitter/Whatever else that green thing is, all look good on top.
Now the body should be just that, the body. If you're going to sneak ads into the body, use text wrapping around the image.
As for the bottom, go to any corporate website and see the bottom of their page. Links down there do not make for an unprofessional site, they make the site more like a business. Terms Of Use, Contact Us, About Company, these are some of the standard links you see on any corporate site at the bottom.
Verdict: Your site looks good, just keep adding and updating content!