What is the difference between hard ware and software setups, and which is easiest?

Is a double ret pally group effective? If not what can i do to enhance them?

Is there an auto slave loot?

Any addons good for boxing in general?

What classes are the best to double up or pair together? (Only have 2 accounts and my comp is a peice so im lucky that it runs that)

So far i have usually just boxed a healer and sometime of AoE dps together, is there a better way?

Ive always thought of boxing a DK with either a healer or anohter DK. Which would be better for pve and pve?

Sorry to seem like a noob.. But i am.

Thanx.