How to get DOOM to work on Windows 8 without downloading any sourcecodes or mods
So, getting Doom to work on Windows 8 is not a long, nor difficult task. I'd like to point out that I did actually get my help from the internet, but I did have to improvise a bit.
First, go to OS (C:) > Program Files (x86) > Steam > steamapps > common > Ultimate Doom > base
Right-click DOOM and go to 'Properties' then set compatability mode to Windows 95.
Then, go to ultimate.conf and open it with Notepad.
Change 'fullscreen=true' to 'fullscreen=false' and 'waitonerror=true' to 'waitonerror=false'.
After that, go to ultimatem.conf and do the same thing.
Then, open dosbox.conf and scroll down to where it says 'waitonerror=true' and change it to 'waitonerror=false'
Make sure you save these changes and close the files.
Go to your Steam Library and go to The Ultimate DOOM and click 'Play'
If it still doesn't work, like it did for me, go to ultimate.conf and change 'fulldouble=true' to 'fulldouble=false'
Do the same thing for ultimatem.conf.
After this, it should all work.
Hope this helped you! :)
P.S. This will work in any game that uses DOS box such as Doom, Heretic, or Hexen