Below are step by step installation instructions for Windows 95/98/Me/2k/XP/Vista:
(For further help and other guides, go to: http://www.kevinbecker.net/zorkguides)
-Return to Zork CD
-Zork: Nemesis CD/DVD
-Zork: Grand Inquisitor CD/DVD

I. Installing DosBox (version tested and used is 0.73).

  A. Download DosBox0.73-Win32 (1.39mb) and install
  B. DosBox by default will automatically attempt to adjust cpu cycles for optimal
     performance
  C. To configure DosBox while playing to improve performance
     1. Use 'CTRL+F8/CTRL+F7' to change frameskiping rate Up/Down
     2. Use 'CTRL+F12/CTRL+F11' to change cpu cycles Up/Down
  D. To configure cd/dvd drive support (skip step if not needed)
     1. Browse your Startmenu for 'DOSBox-0.73' > 'Configuration' > click
        'Edit Configuration' or open the file using notepad, usually located at:
        C:\Documents and Settings\XXX\Local Settings\Application Data\DOSBox\
        dosbox-0.73.conf (where XXX is your computer login name.)
     2. Add the line 'mount d d:\ -t cdrom (windows)'
        (change 'd:\' to whatever drive letter you use for your cd/dvd drive)

II. Installing Return to Zork CD.

   -Needed hdd space is ~136mb.
   -d: is used as the cd/dvd drive, but yours may be different.
   -c: is used as the hdd, but you may use a different hdd.

  A. Create folder c:\RTZ-CD
     (Warning: If you need to reconfigure your sound, repeat steps B-H)
  B. Copy ALL files from d:\ to c:\RTZ-CD
  C. Drag and drop c:\RTZ-CD\install.exe onto DosBox.exe
     (usually located in c:\Program Files\DOSBox-0.73)
  D. Choose 'Drive C:'
  E. Choose 'No' (do not install project file)
  F. Install to \ (change from \RTZ-CD)
  G. Choose 'No' (do not launch from windows)
  H. Choose 'Yes' (change settings now)
     1. Choose 'Sound Blaster 16' > hit 'Enter' > type '220' > hit 'Enter'
     2. Choose 'Sound Blaster 16' > hit 'Enter' > hit 'Enter'
     3. Choose 'Drive C:' > hit 'Enter' > hit 'Enter'
  I. To run, drag and drop RTZ.bat onto DosBox.exe
     (or you can create a shortcut on your desktop to DosBox.exe,
     Right-Click the 'DosBox.exe shortcut' > Click 'Properties' > Edit the 'Target:'
     box to "C:\Program Files\DOSBox-0.73\dosbox.exe" c:\RTZ-CD\RTZ.BAT)

I. Installing Zork: Nemesis CD.

   -Needed hdd space is ~1.45gb.
   -d: is used as the cd/dvd drive, but yours may be different.
   -c: is used as the hdd, but you may use a different hdd.
   -I recommend using the keyboard for panning as the panning is extremely fast
    and there is no fix.

  A. Run d:\setup.exe, select 'Best Performance' and install Nemesis to c:\ZN_CD
     (see step II. if you are unable to run the installer)
  B. Copy the folder d:\zassets on disc 1 to c:\ZN_CD
     Copy the folder d:\zassets on disc 2 to c:\ZN_CD\disc2
     Copy the folder d:\zassets on disc 3 to c:\ZN_CD\disc3
  C. Open the file c:\ZN_CD\nemesis.zix using notepad (or copy the file
     d:\nemesis\znemscr\medium.zix to c:\ZN_CD and rename it to nemesis.zix) and edit
     the lines at the beginning of the file (see below for example and files)
      -Change 'CD0: zassets' to 'DIR: .\zassets'
      -Change 'CD1: zassets' to 'DIR: .\disc2\zassets'
      -Change 'CD2: zassets' to 'DIR: .\disc3\zassets'
  D. Run c:\ZN_CD\znemesis.exe to play!

II. Unable to run the installer?

  A. Create the folder c:\ZN_CD
  B. Copy the following files on disc 1 to c:\ZN_CD
     d:\znemhelp.gid
     d:\znemhelp.hlp
     d:\nemesis\nemesis.str
     d:\nemesis\qmixer95.dll
     d:\nemesis\znemesis.exe
     d:\nemesis\znemesis.ini
  C. Copy the following folders on disc 1 to c:\ZN_CD
     d:\nemesis\znemmx
     d:\nemesis\znemscr
  D. Return to step I. B.

I. Installing Zork: Nemesis DVD.

   -Needed hdd space is ~1.45gb if you run from the hdd.
   -d: is used as the cd/dvd drive, but yours may be different.
   -c: is used as the hdd, but you may use a different hdd.
   -I recommend using the keyboard for panning as the panning is extremely fast
    and there is no fix.

  A. Run d:\znemesis\setup.exe, select 'Best Performance' and install Nemesis to
     c:\ZN_DVD (see step II. if you are unable to run the installer)
  B1. To run from the hdd: (see step B2. to run from the dvd)
      1. Copy the folders d:\znemesis\zassets, d:\znemesis\disc2, d:\znemesis\disc3 on
         the disc to c:\ZN_DVD
      2. Open the file c:\ZN_DVD\nemesis.zix using notepad and edit the lines at the
         beginning of the file (see below for example and files)
          -Change 'CD0: znemesis' to 'DIR: .'
  B2. To run from the dvd:
      Open the file c:\ZN_DVD\nemesis.zix using notepad and edit the lines at the
      beginning of the file (see below for example and files)
       -Change 'CD0: znemesis' to 'DIR: d:\znemesis'
  C. Run c:\ZN_DVD\znemesis.exe to play!

II. Unable to run the installer?

  A. Create the folder c:\ZN_DVD
  B. Copy the following files on the disc to c:\ZN_DVD
     d:\Znemesis\nem_man.exe
     d:\Znemesis\znemhelp.gid
     d:\Znemesis\znemhelp.hlp
     d:\Znemesis\nemesis\nemesis.str
     d:\Znemesis\nemesis\qmixer95.dll
     d:\Znemesis\nemesis\znemesis.exe
     d:\Znemesis\nemesis\znemesis.ini
  C. Copy the following folders on the disc to c:\ZN_DVD
     d:\znemesis\nemesis\znemmx
     d:\znemesis\nemesis\znemscr
  D. Return to step I. B1.

I. Installing Zork: Grand Inquisitor CD.

   -Needed hdd space is ~1.77gb if you run from the hdd.
   -d: is used as the cd/dvd drive, but yours may be different.
   -c: is used as the hdd, but you may use a different hdd.

  A. Run d:\setup.exe, select 'Maximum Install' and install Grand Inquisistor to
     c:\ZGI_CD (see II. if you are unable to run the installer)
  B. Copy the folders d:\zgi, d:\zassets1 on disc 1 to c:\ZGI_CD
     Copy the folder d:\zassets2 on disc 2 to c:\ZGI_CD
  C. Open the file c:\ZGI_CD\inquis.zix using notepad and edit the lines at the
     beginning of the file (see below for example and files)
      -Change 'CD0: zassets1' to 'DIR: .\zassets1'
      -Change 'CD1: zassets2' to 'DIR: .\zassets2'
  D. Run c:\ZGI_CD\zgiwin.exe to play!

II. Unable to run the installer?

  A. Create the folder c:\ZGI_CD
  B. Copy all files from the folder d:\zgi\zgi on disc 1 to c:\ZGI_CD
  C. Copy the folder d:\zgi\help on disc 1 to c:\ZGI_CD
  D. Return to step I. B.

I. Installing Zork: Grand Inquisitor DVD.

   -Needed hdd space is ~1.77gb if you run from the hdd.
   -d: is used as the cd/dvd drive, but yours may be different.
   -c: is used as the hdd, but you may use a different hdd.

  A. Run d:\zgi\setup.exe, select 'Maximum Install' and install Grand Inquisitor to
     c:\ZGI_DVD (see step II. if you are unable to run the installer)
  B1. To run from the hdd: (see step B2. to run from the dvd)
      1. Copy the folders d:\zgi\zassetsc, d:\zgi\zassetse, d:\zgi_e on the disc to
         c:\ZGI_DVD
      2. Open the file c:\ZGI_DVD\inquis.zix using notepad and edit the lines at the
         beginning of the file (see below for example and files)
          -Change 'CD0: zgi' to 'DIR: .'
  B2. To run from the dvd:
      Open the file c:\ZGI_DVD\inquis.zix using notepad and edit the lines at the
      beginning of the file (see below for example and files)
       -Change 'CD0: zgi' to 'DIR: d:\zgi'
  C. Run c:\ZGI_DVD\zgiwin.exe to play!

II. Unable to run the installer?

  A. Create the folder c:\ZGI_DVD
  B. Copy all files from the folder d:\zgi\zgi_e on the disc to c:\ZGI_DVD
  C. Copy the following folders on the disc to c:\ZGI_DVD
     d:\zgi\help_e
     d:\zgi\install
  D. Open the file c:\ZGI_DVD\Inquis.ini using notepad and edit the line:
     'MPEG=1' and change to 'MPEG=0'
  E. Return to step I. B1.

III. For DVD quality video playback in Windows 95/98/Me ONLY.

  A. Download and install either SoftDVD (16.4mb) OR DVDExpress (20.3mb)
  B. To run from the hdd follow steps C./D1.; to run from the dvd follow step D2.
  C. Copy the folders d:\zgi\eng_mpeg, d:\zgi\engmpegc on the disc to c:\ZGI_DVD
  D1. Open the file c:\ZGI_DVD\inquisc.zix using notepad and edit the lines at the
      beginning of the file (see below for example and files)
       -Change 'CD0: zgi' to 'DIR: .'
  D2. Open the file c:\ZGI_DVD\inquisc.zix using notepad and edit the lines at the
      beginning of the file (see below for example and files)
       -Change 'CD0: zgi' to 'DIR: d:\zgi'
  E. Open the file c:\ZGI_DVD\Inquis.ini using notepad and edit the line:
     'MPEG=0' and change to 'MPEG=1'