"......and then text saying "Realtec PCIe GBE Family Controller Ser' v2.38""
Is that the entire message you see while the bootup is stalled? If not then please post as much of the text as you can.
"I suspect it has something to do with the Boot Sequence."
That's what I think too - it sounds like your PC's trying to initiate a network boot, it keeps trying for a while, gives up, and then Windows boots normally. Anyhow, let me know the answer to my question including the make and model of your PC.