To install zombiecraft on windows:
- Go into the start menu and "search" %appdata% locate the .minecraft folder
- Backup any and all saves, texture packs, and mods you wish to keep. Delete the .minecraft folder
- Launch minecraft from the file you (probably, pirate) downloaded from the minecraft site.
- After successful launch, run the zombiecraft launcher and use it up untill you play a map
- Reinstall all mods to .minecraft
- Place saves back in saves folder, and texture packs in the corresponding folder
When downloading fresh zombiecraft,it will install automically during launch.