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The network card (also the sound and video) is integrated onto the motherboard on this computer. You probably just need to install the drivers. You can download the drivers from Dell here. Also make sure the onboard network hardware is enabled in the computer's BIOS setup. (If you didn't use a restore set from the manufacturer and just install Windows, you almost always need to install the drivers for integrated hardware.)
If you have built in 10/100 RJ45 then any network connection is possible.
One to one, you can connect to any built in 10/100 RJ45 equipped computer with a 'cross-over' network cable.
More commonly you can connect to a 'router' which allows a number of computers to connect to each other and to the internet . Use a search engine to find net setup on the 'web. This is a very large subject so you need to decide what you want to do first!
See http://www.computerhope.com/issues/ch000469.htm#04 or http://compnetworking.about.com/cs/lanvlanwan/g/bldef_lan.htm or even http://www.microsoft.com/windowsxp/using/networking/setup/default.mspx
go to cotrol panel> system>device manager and look next to display adapters, network adapters and sound, video, game controllers. Click on the + sign next to each one to discover which or the following you have:
Did you mess around with the settings in your BIOS? If you did, make sure the boot settings are such that your computer tries to boot from your hard drive as the first or second option. It seems you might have changed the setting so your computer tries to boot from the network instead.
If that's not the issue, is your hard drive currently being recognized when the computer is started? What Realtek products do you have? I assumed the Realtek product is your Network Interface Card (the one that you connect an ethernet cable (one that looks like a phone cable except bigger) to, also called an NIC).
Make sure you didn't disconnect any cables that were previously connected when you installed the video card. Specifically check the IDE or SATA data cables that connect your hard drive to the motherboard, and the power cable that's connected to your hard drive.