[Smoky]

There is no external video card. But your card is extremely unbalanced with your processor! You should really upgrade it, it's not very hard. If your dad don't want, you can go at a computer shop and pay someone to do it. Upgrading your video card would be a very good thing.

For the lag, you say it was running great with your 56k and now it lag. Did the game ran better before you get the cable? If so, is your cable modem connected with a USB port or in a network card?

USB often cause some troubles. It's always better and more stable qhen the modem is connected in a network card.