Comment Quit bitching and download Visual Studio Express. (Score 2) 226
Visual Studio Express is Microsoft's zero-cash programming environment. Why do you want a high-cost office suite with a lousy macro engine to be discounted to free when they already offer their actual development suite pro bono. It's upgradeable to more complete Visual Studio versions later. This will encourage Microsoft-centric code, but that can be avoided and it's less specific of a tie-in than VBA. C#, C, C++, and more are included.
If you don't want to be tied to Microsoft-specific tools even on Windows there are other options. Those include other office suites and other actual development tools.
LibreOffice/OpenOffice have OOBasic and can be scripted with Python and Java if you really want. These things are zero-cash and open source.
You can use Lazarus and FreePascal (Wikipedia article about FreePascal) or Eclipse and Java/C/C++ if you'd rather. Or you could use Eric and Python. Or Padre and Strawberry Perl, complete with MinGW. Some of the IDEs are more or less general and language agnostic, while others are mainly narrowly targeted.
Don't forget MsysGit (git for Windows) if you're not using Cygwin and haven't already chosen a version control system.
Really, you could be teaching with a good programmer's editor rather than specifically with IDEs too. vim, Emacs, jEdit, Gedit, and others are applicable. Some of them are powerful enough to make that line between editors and IDEs very fuzzy.
What, exactly, would a free copy of Word get you that isn't already available?