I see some sentence flow and structure issues early on. Nothing huge, but it does make reading a bit more difficult. That may just be your style of writing, though. I can provide greater detail, if you like.

SCP-# is a computer network, comprising of four sets of desktop computers interconnected to one another via LAN cables and four 500 GB hard disk drives connected to each computer. All constituent components of SCP-# are welded together, functioning as a singular device. Approximately 90% of the network's overall memory is utilised to accommodate the presence of an entity classified as SCP-#-A.

This part is a little jarring to the IT professional in me. How are the computers connected? Do they have multiple network cards each? Is there a switch or router involved? Unless one machine is functioning as a switch/router, each machine would need 12 network ports to create the sort of network you describe. Or, they could all patch into one switch or router with only one network interface each. As far as whether to use a switch or router, for a small network like this, it really wouldn't matter much. In larger networks, both switches and routers have specific functions, but here one or the other would be fine. The main difference would be that a router would allow contact to the outside world.
Next, the hard drives. Are these internal or external devices? If they're internal, okay, cool, just note that each machine has a 500GB HDD. If they're external, are they connected to each machine individually via USB, eSATA or Firewire or something or is it a block of four 500GB drives in a network attached storage? I think the usage you're going for is more the NAS solution, where the machines each have an internal HDD and then also share this 2TB pool of drives.
Lastly, welding network components is…tricky. It might be better to say hardwired. This is kind of a technical quibble, but it's something that will jump out at a fair number of people. Welding is bonding two objects together through application of heat and, usually, an intermediary material. Hardwiring, on the other hand, would imply that the components are soldered (a type of welding for small, delicate components) or otherwise permanently connected, rather than the typical modular connections most people are familiar with.

handle name is consistently "Kurutururyo"

Perhaps include the English translation of this, unless that's part of the reveal later. Also, handle name is kind of an awkward phrase that seems a bit too colloquial. Username might be better, but I would suggest saying that "it gives its name as…" or "it names itself…"

The rest looks pretty good, barring the previously mentioned flow issues. I like the Lovecraft callouts, though I'm not certain that particular phrase is most appropriate in this context. Maybe something more relating to the Deep Ones or Father Dagon and Mother Hydra. The "that is not dead…" line refers specifically to everyone's favourite squid-headed destroyer of sanity's death and eventual resurrection. So, unless the entity on the computer really IS Cthulhu and Kurutururyo is the Japanification (Katakanjization? What is the word for adopting a non-Japanese word into Japanese? I know it's Anglicizing for English…) of his name…

Anyway, like Azzle said, the second interview could definitely use some fleshing out. Especially if the point you're going for is that this is Cthulhu.