After installing the H2V-EK, Windows users must prevent the Virtual Store from interfering with it.
The Halo 2 Editing Kit, or Halo 2 Vista Editing Kit (H2V-EK) as it's referred to on this wiki to disambiguate it from the newer H2-EK, is the official suite of modding tools released by Hired Gun alongside the Halo 2 Vista port in 2007.
The kit consists of cut down versions of Bungie's own internal development tools, a tutorial, and commonly used data and tags for map development. Because the tools are so limited in functionality compared to their internal counterparts, or even the HEK, community mods like H2Codez were created to expand modding capabilities.