Hello everyone, I stumbled onto this site today and I erratic about some people being able to multibox on one machine. Here are my current specs;

CPU: [font='']AMD Athlon 64 X2 4800+ Brisbane 2.5GHz Socket AM2 65W Dual-Core Processor[/font] (Looking to go quad 3.0 AMD soon)
VGA: XFX HD-485X-YDDC Radeon HD 4850 XXX 512MB 256-bit GDDR3 PCI Express 2.0 x16
RAM: G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Dual Channel Kit Desktop Memory Model F2-6400CL5D-4GBPQ
HD: [font='']Seagate Barracuda 7200 160GB 7200 RPM SATA 3.0Gb/s Hard Drive[/font]
PS: RAIDMAX HYBRID 2 RX-630SS 630W ATX12V V2.2/ EPS12V SLI Ready CrossFire Ready Modular Modular
MOBO: ASUS M3A78 Pro AM2+/AM2 AMD 780G HDMI ATX AMD Motherboard

I am currently running Windows Vista on a 19" Monitor.

What should I do to be able to run 2 instances at once on 2 different monitors with 40-50 fps?