The IBM/Windows version of PREPRO2002 comes with executable codes, in compressed form. 1) To uncompress and install, copy INSTALL.BAT and PREPROZ.EXE to your hard drive. Execute INSTALL.BAT - WARNING - DO NOT execute PREPROZ.EXE, or the system will not properly install into a directory structure. After installation you can delete PREPROZ.EXE and INSTALL.BAT. 2) To VERIFY proper installation, it is recommended that after installation you execute VERIFY.BAT (You may have to rename this file if it clashes with a DOS command). This is a batch file that will run the codes in sequence. The final two codes will display the calculated cross sections (EVALPLOT), and compare the results you calculated to a standard set of results (COMPLOT). Difference of about 1 % are acceptable; larger differences indicate an installation problem. 3) If you have any problems notify the Nuclear Data Section, IAEA, Vienna, Austria. services@iaeand.iaea.or.at