I try to follow your steps. But it still has problem see below. Any suggestion. Thanks!!
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C:\>sqlplus system/manager

SQL*Plus: Release 8.1.6.0.0 - Production on Wed Feb 12 09:18:03 2

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Connected to:
Oracle8i Enterprise Edition Release 8.1.6.0.0 - Production
With the Partitioning option
JServer Release 8.1.6.0.0 - Production

SQL> archive log list
ORA-01031: insufficient privileges
SQL> connect /as sysdba
ERROR:
ORA-01031: insufficient privileges


Warning: You are no longer connected to ORACLE.