You need to find out what network adapter you have on your machine. With this you can find and download the right driver for it - you usually will find this on the computer manufacturer's page. They may also be on the original install disks or CDs that came with your system, look under a folder called drivers.
When you get them, when asked to install from another location, point the install program to the location where you put the files and voila! Drivers installed, card working, fresh network connection!
Good luck.
Bob Smith, January 2009