Windows Vista – Click Start/Vista icon, right click Computer and left click on Properties. Click on Device Manager. You should see a list of devices on your system. Find the item on the list that says Network Adapters and then click the + (plus sign) next to it. If it has a – (minus sign) instead, ignore this step. Under Network Adapters you should see a list of all network adapters installed on your computer. If you have an Ethernet card, it will be listed here.

Windows XP – Click Start, right click My Computer and left click on Properties. Click on the Hardware tab. Click the Device Manager button. You should see a list of devices on your system. Find the item on the list that says Network Adapters and then click the + (plus sign) next to it. If it has a – (minus sign) instead, ignore this step. Under Network Adapters you should see a list of all network adapters installed on your computer. If you have an Ethernet card, it will be listed here.