Can't install Windows 8.1 on new computer?

I just got a Lenovo Z50-70 and it comes with FreeDOS. I opened the BIOS and set the ODD to boot priority and inserted the Windows disc and it goes straight to a screen that says "Loading FreeDOS 123 Init Disk" and asks me for the time and date and gives me a line that says "C:\>". I also tried accesing the Button Menu and choosing the boot device but same thing happened. What could be wrong? I know the disc is OK because I opened it on another computer.

Start your computer. Insert the disc.
Then restart your computer. After you hit the power button start tapping what ever button gives you the boot menu. I don't know on your computer. Anyway use your up and down arrows and select DVD/CD. Then hit enter.