I've been presented with this problem before. I have two solutions, both of which use my favorite "quick-n-dirty" editor, SciTE (free and open-source).
First, SciTE is available as (among other things) a statically-linked, single-file executable for Windows. It's possible you'd be allowed to run that (and thus get a syntax-highlighting editor to display your code) off a USB flash drive, since it requires no installation.
Failing that, your second option using SciTE is to use its capability to export highlighted source code to RTF, HTML, PDF, etc. for display in the appropriate viewer.
Personally, I like to export to RTF, paginate by hand (for presentations, I don't like subs spanning pages, and I like to use landscape orientation), then convert to PDF for presentation. However, if you're confident you'll have Word available, I've found it quite instructive to save the RTF as a DOC and annotate it in the margins.
Ramblings and references
The Code that can be seen is not the true Code
I haven't found a problem yet that can't be solved by a well-placed trebuchet
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