One common problem with InstallShield was
the failure to get things installed properly. The scenario is as follows:
the setup runs normally, some error occur, and InstallShield removes
everything (normal default behaviour!). Several errors can trigger this
scenario:
the CD-ROM is damaged
your cdrom reader fails to read correctly several thousands
of files because of a buggy driver
there are errors on your hard disk
your hard disk is full; this can happen quickly because of the
32k cluster size of the FAT filesystem (the 40000 files need
about 800Mb to get installed on FAT)