Sorry not to have responded earlier, but I have had my own troubles today - self-inflicted - and only just noticed Nick's PM. I have had a fairly hard look at your Speccy report and there are two or three things that need attention, but I'll come back to them later.
I downloaded the driver and transferred it to my system. I loaded it up, and yet Vista still won't recognize the LAN Realtek attached to my computer. The wires work with activity before Vista boots up
It is not just a matter of transferring the driver to the system, it has to be installed, but it has to be said that Dell's bar-code system is brilliant for drivers and updates for their computers.
To install a LAN driver you need to get into 'Device Manager'. Click 'Start - Control panel - System' OR, if you have a Computer or System icon on the desktop, RIGHT click on the icon then select 'Properties'. Both take you to the system control panel. Towards the top left of the screen you will see 'Device Manager', click on this and the Device manager will open. It lists the devices attached to your computer, and about half way down you will see 'Network Adapters'. Click on the '+' sign beside it and it will expand to show all the network drivers. There should be one called 'Maker's name' - 10/100 Ethernet'. My manufacturer is nVidia, but yours is likely to be Realtek, Intel or Via.
Double click on this line and the control box for your LAN connection will appear, and across the top of this box is a row of tabs. One of them is called 'Driver'. Click on this, then click on the button 'Update driver ...' . This opens another box which offers two choices - 'Automatic search' or 'Browse'. Since you have the driver, you need to click on 'Browse'. Then navigate to wherever you put the driver file, select it, then click 'Install'. Let it finish installing, this shouldn't take more than a few seconds, then close all the boxes and re-boot your computer. Hopefully, your LAN will now work. If it doesn't, post back.
The other things I noticed from your Speccy report is that your A/V is disabled. This really should be enabled. If it will not turn on, mention this in your next post - malware is always a possibility but since your firewall is active, less likely in your case.
The other thing I noticed is that you are using Internet Explorer v7. This should be updated to the latest version Vista will support, probably v9. And you don't seem to have any printer drivers installed. Is this because you haven't got round to that or that you print by some other means.
Hope this helps towards your most pressing problem - the LAN connection, but turn your A/V on !