Right downloaded this game anew, installed it via the OP instructions and here is the answer to a few questions i see, had to spend time trawling through other forums for answers in some cases.
Answers:
1. Annoying screen flicker. This is an issue regarding compatibility. Run the compatibility troubleshooter and it will eventually fix the issue. It tried vista/7 then gave me options, one option said it displays incorrectly. Then it ran again and set compatibility to scale with high dpi and boom its fixed.
2. Fullscreen not working/not working correctly: This is a settings issue and a scaling issue with wide monitors.
Settings issue is solved right quick. Press f10 in game and in the bottom right of the box that shows up, the top option is selected, switch it to the bottom option. Then ingame select fullscreen.
Scaling issue: Due to the game being, well, old. It doesnt have the capability to scale properly to modern monitors. This is why you will either play the game windowed or when fullscreen, it will not be centred but rather be left aligned. This can be solved with an app you can get on steam called lossless scaling. You can get the demo version or the full version(its only 3.99 so i got the full version). If you use the demo, refer to page 6, post 118 on how to lossless scale the game properly. If you use the full version, it is much more simplified as you can just run the game windowed, run the program, set the scaling to auto and then while ingame press the shortcut to scale the game to fullscreen.