My Halo rig is: Custom, But Rubbish..
Processor/Type/Speed: Intel Whatever (R) Thing 2.8GHZ
MOBO (motherboard maker) : Not A Clue...
Hard Drive: 149GB and 37.9GB...
Ram memory/type/amt./speed: 2 x 512mb Doing That Dual Channel Thing.
Video Card type/speed/memory: NVIDEA GForce 6200 256Mb... (I think..)
OS & service pack: Windows XP Pro SP2 And Windows Vista Ultimate.
DX version: Direct X 10 Or 9.
Sound Card: I Have One...
Speakers/Headphones: Genius 2.1
Internet connection, type/speed/provider: Really Cruddy Broadband. 100Kbs D/L At The MOST.
Monitor size/type/qty: 22Inch Samsung. LCD HD Thing (Well Good!)
Mouse, type: Plain Old Mouse.
Keyboard (or similar device) type: Wireless. Thats ABout All I Know...
Modem, type: Netgear Wireless Router...
It's nothing amazingly special. But it will run what i want it to. Halo no problems, CS:S Minimal problems. Theni just play videos and music constantly.