For code scripts, I'd suggest inserting properly formatted code directly into the document, with a suituably-defined 'code' paragraph Style (this will help ensure a consistent layout thoughout the document).

As for your screenshots, you'll never get anything better than screen resolution, so use the highest-resolution screen you can get access to. You might need to experiment with Windows themes (probably not using Aero) to find one that works well when converted to grayscale. Finally, make sure Word's image compression is switched off (before inserting the screenshots) - it can only degrade your images.

__________________
Cheers,
Paul Edstein
[Fmr MS MVP - Word]