gVim Portable is a feature rich and not-too-hard-to-use text editor, and a very feature rich one at that. With gVim you can code, highlight syntax, and do everything else you would expect of a text editor worth its weight in megabytes.
"To make gvim portable you need only change the HOME directory. It does not take more than a small batch script to accomplish this.
Suppose you have already downloaded the gvim archive as well as its runtime files and installed them. Your gvim installation is something like this:
C:\path\to\your\vim\vim81\gvim.exe
where 81 is the version number which may change accordingly.
Create a home directory just parallel to the folder containing gvim.exe, and a batch file (named portable_gvim.bat, say) right into the gvim.exe folder, like this:
