Has this disk got Windows install in it? (bootable on new PC + images

going to be building my new PC tomorrow just wanted to know, can I put this disk into the DVD drive and will it allow me to boot up windows installation, I downloaded the "windows media creation tool" and followed the steps on it, it then downloaded and placed this into the DvD

You'll never know till you try it.

Where did you get the ISO file that you then burned to the DVD?

I done it about an hour ago, I got it from the Windows Media creation tool I downloaded that from this site here

Creating installation media for Windows 8.1 - Windows Help


I clicked on the purple button (link) and got the download instantly, selected the windows 8.1 pro option as I have a key for it, then it asked about then I selected English it started downloaded the installation file, then it put it on the DvD (burned it) I presume.

I'd at least see if that disk you burned does in fact boot your current PC and leads you to the expected Windows 8.1 installation screen. If it does, then just cancel out of it and reboot to your hard drive.

If it won't boot your current PC, it's not likely to boot the PC you build tomorrow.

ok so I pressed F8 and selected to boot on the DvD drive, it just loaded windows as normal and asked for my PW to log into my PC ..

Well, that sounds to me like that DVD does NOT boot your PC---unless you did not correctly choose the DVD drive as the boot device.

You have to figure that out or I'd expect the same thing to happen tomorrow on your new hardware.

I have no experience at all with the Media Creation tool, Windows 8.1, or your PC, so I can't say where you went off the track.

Will the new PC be a BIOS/MBR system or a UEFI/GPT system?

Most newer system are UEFI/GPT so you would need to create a UEFI/GPT install device. I'd recommend a 4GB or 8GB (or larger) flash drive instead of a DVD.

You can use Rufus to create the flash drive from the ISO you now have (from Media Creation Tool).