Help me build/rebuild!

[Avioz]

Okay so I want to start into PC Gaming but I don't have the type of pc that would be enough to handle.
At the moment I have HP Pavilion Slimline s5610f
Specs are here: HP Pavilion Slimline s5610f Desktop Computer With AMD Athlon II 250 Dual Core Processor by Office Depot

Okay well I have 370 spare dollars so if you guys can help me choose on what I need to run PC Games like : COD, BF2, Moh, WoW, ect

Thanks in advance sorry for being a newb

 

[Trotter]

This will not be pretty. In order to keep your Win7 you will have to keep your current motherboard. So we will work around it.

First we start off with a new case and power supply, then we swap out a quad core for your current dual core and add a 4870 graphics card, and then we swap out a stick of 2GB for the 1GB stick in your computer (you should only have two DIMM slots for memory, and your specs say you have 3GB so that should be a 2GB and a 1GB).

Newegg.com - Rosewill R519-BK Black Computer Case 500W Power Supply
$60 + $10 shipping

1. XFX HD-577A-ZNFC Radeon HD 5770 (Juniper XT) 1GB 128-bit GDDR5 PCI Express 2.0 x16 HDCP Ready CrossFireX Support Video Card
2. AMD Athlon II X4 640 Propus 3.0GHz Socket AM3 95W Quad-Core Desktop Processor ADX640WFGMBOX
Combo Price: $241 w/free shipping + $20 MIR

Newegg.com - Rendition by Crucial 2GB 240-Pin DDR3 SDRAM DDR3 1333 PC3 10600 Desktop Memory Model RM25664BA1339
$34 w/free shipping

Total w/shipping = $346