Hello Download here at dell:
http://www.dell.com/support/drivers/us/en/19/Product/dimension-4550
Select network and download the driver.
You have to try one of the drivers because here are many different ones.
Here is only drivers for win xp.
Good luck
Purchase a USB memory-stick.
On another computer with Internet access, access: http://support.dell.com and select "Downloads and Drivers". Select "Dimension". Select "4550".
Select "Network Adapters". Download the device-driver, copying it to the memory-stick.
Move the memory-stick to your computer, and "install" the device-driver.
SOURCE: Ethernet Controller is missing
You are unable to use the Ethernet, VGA etc. because you have not installed the drivers for the same.
You might have received a Drivers CD(it will read "Drivers and Utilities") which will be in blue color, when you got the computer from Dell.
In case if you haven't received it you can contact Dell on 1-800-624-9897 and request for a Driver CD. I guess this Dimension model is @ End of Life (I mean no more produced by dell) you might have to download the drivers from Dell's support site (www.support.dell.com) you will have to get it downloaded on a different computer and copy on a CD or a Flash drive.
Once you got all the drivers. First extract them in a separate folder
Go to Device manager
Right click on the Ethernet controller (where you see a yellow exclamation)
Click update drivers
Show the path where you have the driver files
Click "Start" to open the "Start" menu.
Right-click on "Computer" or "My Computer," depending on your version of Windows.
Click "Properties."
Click "Device Manager." This will be located on either the upper-left side or on a tab at the top of the "Properties" window, depending on your version of Windows.
Double-click on "Network Adapters" in the "Device Manager" window. This will display your Ethernet card.
Right-click on your Ethernet card and click "Update Driver Software..."
Select the option to search automatically for updated driver software. This option will search the Internet for any new drivers available for your Ethernet card. If you presently have the latest drivers then you will be prompted that the latest drivers are already installed on your system and the window will close. If new drivers are available they will be automatically installed.
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