System drive "z" ??

I need some education from the experts. I turned my desk top pc on to do a couple of things and I noticed that a lot of the CPU was being used. I assumed it was downloading updates so I left it running. I went back after about 20 minutes and the system host was using 100% of the CPU and the disk space is maxed. I opened the file explorer and I noticed that a new drive existed. It's Drive Z and it says it's a system drive. I also do not have access to it and if I go into properties to take ownership, all of the options are greyed out. The drive never existed before; at least I don't think it did..

What the heck is this Z drive?? It's 400 MB in size.

Oh, it's running windows 8.1..

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System drive "z" ??