|"display adapter, is a ATI radeon 3000"|
You did poorly listing your specs (no motherboard, no RAM details, no power supply, etc) but at least you threw the graphics in at the end.
You don't have a video card at all, you have integrated graphics. The Radeon HD 3000 IGP is not good for gaming & if you check the list, it's not supported by StarCraft II Beta.
You need to update to a *real* gaming card.
Best Graphics Cards For The Money: April 2010