Hello nelsonmugo, try to check device manager in control panel, if there is mark (question or exclamation mark) on network adapter or unknown device then u need to install your network adapter. this is the step:
1. insert motherboard driver to CDROM/DVDROM
2. right click on the mark then choose update driver.
3. follow the step and click next, choose recommended search. your driver will be installed automatically.
if there is no mark on network adapter or unknown device, then high probabilities there is damage on your onboard adapter (hope it's not happen).
hope this useful, regards.
You will have to open up your network connections click start control panel network connections this may vary depending on your operating system look for local area connection if you see a red x or a yellow exclamation or question mark you will need to update or install the driver or it could be firewalled or you could click start control panel administration tools computer management device manager look for network adapters + expand Ethernet driver if you see a yellow question exclamation mark or a red X you will need to update/reinstall the driver for the device if you computer came with a motherboard disk the driver could be on it or you might have to download one http://majorgeeks.com/downloads35.html also this link will provide you with many freeware and share drivers hope this helps you
also
the drivers might be installed for this device
click start control panel administration tools computer management device manager scroll through all of your devices if you see a yellow question or exclamation mark ? ! or a red X you will need to update the drivers for this device right click select update driver/reinstall driver
if you can see your usb device but its not working scroll to Ports(Com&Ltd) right click to update driver if you computer came with a motherboard disk the drivers could be on it
http://download.cnet.com/Realtek-RTL8139-Family-PCI-Fast-Ethernet-NIC/3000-2112_4-91313.html
if this driver is not right
http://download.cnet.com/2000-20_4.html
on the home page you should see a search tab just type in what you are looking for
(be precise)also the download software finder under that there will be a list place a tick in the box of any one you want/need
all software windows software mac software mobile and web apps
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