To install Win32s on Windows 3.1, it is necessary to run the MS-DOS Share utility before starting Windows. Add SHARE.EXE to your AUTOEXEC.BAT file.
SHARE.EXE is not required for Windows for Workgroups .
It is recommended that your CONFIG.SYS file set number of files to at least 30.Set files=30 in CONFIG.SYS if there is no files command line or if it specifies less than 30 files .