To update your firmware go to http://support.dlink.com/
To change your nic setting in Windows XP (9x/me is similar) Click Start>>Control Panel>>System.
Then click on the Hardware tab>> click on Device Manager,
look for a section labeled Network adapters, right click Properties Click on the Advanced tab, look for NetworkMedia and change the value to 10BaseT Full Duplex[/b}
You do not have to reboot your computer to see the changes.