Another way is to use a modern interpreter, like
or [url=http://www.ifarchive.org/if-archive/infocom/interpreters/frotz/WindowsFrotz.zip]Windows Frotz. It should use the same keyboard layout as you use in Windows.
You need to get the game file from where you installed the game; it should be a *.dat file, likely ZORK1.DAT, and should reside in a DATA folder if it uses the standard Infocom installation structure. Simply start your interpreter and select that file to play it.
Gargoyle is usualy prefered for its soothing look and use of modern font rendering systems, but it has troubles with the graphical versions of the Infocom games, Zork Zero being one of them. Windows Frotz on the other hand is more compatible and will play all Infocom games without trouble. You still need the game file for that, but the graphic will need to be repackaged in Blorb format. Luckily for you,
someone already did the work (those only contain graphic and sounds for the few Infocom games that supported them; the games themselves will need to be acquired somewhere else).
I'd say that you should keep both Gargoyle and Windows Frotz but you can also just keep Windows Frotz if you prefer.