Nvm my previous advice, that's a garbage psu. Return
it, don't ask for a replacement.
First, it has no 80+ rating. Second, take a look at the sticker, it says 400W total and 550W max output. This means that 550W would be overpowering it and it's actually a 400W psu. Though it'll perform worse than a half decent 350W.
Buy a proper one like http://www.newegg.ca/Product/Product.aspx?Item=N82E16817371033
300W would suffice for that system, so 380W will be perfect. If he wants it to be upgradeable, go with a slightly higher one.
Here's a very brief guide:
-80 plus rating is a must. looks like this
or in a different color. (platinum > gold > silver > bronze > white) it doesn't matter much though unless you care about maximal efficiency, which you likely don't in that kind of system.
-half decent (or better) brands (still make sure they have 80 plus): Seasonic, Corsair, Antec, Coolermaster, pc power and cooling, enermax, zalman, kingwin, silverstone, thermaltake, xfx, ocz and plenty more. These brands are not all equal (at all), but any should provide a psu that will work.
-you get what you pay for, almost always.
The Antec Earthwatts are great 380W or 430W choices. Seasonic also has great options in this range.