CASE 5.1 - installation problems

When I try to run CASE*DBA to import a CASE*Dictionary 5.0 user, I get a 'General Protection Fault', either

'EXPORT .... GEN PROT FAULT ... Winsock.dll ... 0001:0ec3'
or

'CDAPPEND .... GEN PROT FAULT ... CDAPPEND.EXE ... 0001:049A'
at various points in my installation.

N.B. CASE*DBA always manages to complete step 1 'create tables/triggers'

Any help gratefully received,

Thanks, Kevin.

P.S. Configuration :

SERVER - Solaris 2.2               CLIENT - IBM 466DX2 16Mb memory
         ORACLE 7.0.16.6.0                  DOS 6.1
                                            MS WINDOWS 3.1
                                            CASE 5.1.7
                                            SQL*Net 1.1.7.10.4 ???


======================================================================
Kevin Johnson                      EMAIL  :  johnson_at_mail.esrin.esa.it
Information Administrator          PHONE  :  (+39) 6 941 80 633
European Space Agency              DISCLAIMER :  These views are mine
Via Galileo Galilei                              not necessarily those
Frascati   00044                                 of my employer.