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Battlezone cannot be found. Please reinstall Battlezone, then reinstall Odyssey.
BZ98 installs BZ and RO and modifies the registry properly. If you are having issues that means you installed another BZ afterwards, which confused RO. Since BZ in BZ98 is as same as the original, there's no need to have 2 versions installed. If you for some reasons decide to do that anyway, install BZ98 last. Like that its registry won't be affected.
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I can't install the original BZ because the splash screen stays stuck
What you mean by "splash screen stays stuck"?
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I can play the game on my bro's computer, but because the fps exceeds 60, the computer AI vehicles go and shoot way too fast and the video is all choppy.
In HW mode, you can (and you should) limit FPS to 60. Check
FAQ.