Even if it did you probably wouldn't
WANT to upgrade that box. Most people I've dealt with never have good experiences with best buy and their computers. Might be worth saving the money for a little better system. Keep in mind... even if they are selling that computer for 300 dollars they are STILL making a profit so it begs the question. How much is it really worth.
Let me be clear before you dive into this... you will have issues upgrading a proprietary computer from dell or HP. etc.
You might wanna
read this 1st before buying. 
The cpu you are talking about is a rebranded CPU it is actually an Athlon II 275
You may wanna
post your budget HERE and see what some guys manage to put together.
You can get this cpu :
AMD 255 dual core 60 dollars
You can get any of these
motherboards 60 dollars
Ram is so friggin cheap right now
RAM!! 4 gigs 30 dollars
You get the idea here right? 150 dollars and your more than half way there.
