There's no need to be sorry - it's a help forum.
I don't know what NIC is in your machine. Realtek makes controller chips and they provide reference drivers, so you could download straight from them: Realtek
Before you do that, you might want to first check whether there are any "Realtek" updates available from Windows Update (click on Windows Update in your start menu), and whether you can figure out what make/model of NIC you've got, so that you can download more specific drivers from the manufacturer's website.
The crashes may go away with the NIC drivers updated. Just be methodical and patient. 0x124 is indicative of a hardware problem, as I mentioned earlier, so if you keep on getting those you'll eventually have to reinstall the OS from scratch in a last-ditch effort to avoid taking the thing back to the shop. That's inconvenient but it's not a tragedy. It's far worse, in my opinion, to keep putting off the inevitable until the warranty period expires, at which point any lingering hardware defects become Your Problem.
With new machines, I personally prefer to RMA sooner rather than later. There's no reason why I should have to live with the suspicion of lingering hardware defects in something I just bought brand new.
EDIT: I just noticed you're still on SP1. You should apply SP2 as a matter of priority. In addition to various fixes, it includes an update which prevents 0x124s being registered as a "false positive" (in situations where the hardware is not actually faulty).