Yea your graphics card isn't very good and you might want to think about upgrading it. If you want to, just give us a price range and we can help you out. BTW, i'm selling my ATI Radeon X700 Pro 256mb PCI-E video card which is a lot better than your X300.
AMD 64 3200+ Newcastle@ 2.2Ghz
1GB (1x1GB) OCZ Performance Series
ATI X700 Pro 256MB OC\'d 475/525
OCZ Modstream 520W
Samsung 914v 19\" 12ms LCD
SB X-Fi w/ Logitech Z 5300e