You do not install FreeDOS to your C: drive. If you boot from a USB Stick or CD with FreeDOS on it, the DOS OS is on the removable device. If you remove the removable device, or choose not to boot from it, it will boot into Windows.
If you have a bootable Flash drive. You would boot off of the USB drive in Windows 8 as you would any other Windows OS. Boot into Setup (Bios) go to Boot Priortiy and change the boot order to USB as first boot device. Save and Exit
If you have a UEFI Bios on your computer, you may need to build a USB Flash drive with this utility: How To Make UEFI Bootable USB Flash Drive to Install Windows 8 | Next of Windows
FreeDOS is a free alternative to MSDOS. There are DOS web browsers available but they are very primitive by modern standards and compatibility with modern websites is not good. Configuring such a browser is not simple. Not very practical.
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