Upgrading Gt5228 Desktop

Hi all.

I want to upgrade my GT5228 Desktop Computer for the new expansion pack for World of Warcraft that is coming out. The game already runs bad at low settings max 8-10 FPS in crowded areas.

I want to upgrade the Graphics Card and get a new PSU also expand my RAMM to 4 gigs.

My issue is I am unfamiliar with computer hardware and can use some advice. I am frightened at the thought of replacing the PSU as I think my PC will be ruined. But I will have too. So if anyone has suggestions on compatible PSU and a good graphics card, it will be greatly appreciated. Also is the process in installing PSU long alongside the video card? I hope it is not more than 3 hours.

My budget is about 250ish give or take.
 
Sorry that was my typo not CPU meant PSU. A new PSU to complement a graphics card and to bump up the RAMM to 4 gigs. Yes that is my computer.
 
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