It's at least XP cause its telling him the cable is unplugged...Here is the first question.
What OS are you using.
Third question. Lower right hand corner of your desktop, by the clock (called the system tray), is there a network connectivity icon (looks like 2 pc monitors superimposed over each other). Does it have a yellow ! (exclamation point)? Does it give you any info when you mouse over it?
Click on Start > Run > and type 'Command' and then enter. In the black dos box that opens, type in 'IPCONFIG'. What does that say?