I installed Oracle 8i in Windows 2000 advanced server box for testing purpose. Yesterday I restarted the server and got this error message: ORA-01033 Oracle initialization or shutdown in progress. I can not start DBA studio and SQLplus. The error message is the following:

SVRMGR> connect sys as sysdba
SVRMGR> shutdown
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SVRMGR> startup
ORACLE instance started.
Total System Global Area 98674716 bytes
Fixed Size 75804 bytes
Variable Size 77733888 bytes
Database Buffers 20787200 bytes
Redo Buffers 77824 bytes
Database mounted.
ORA-16014: log 1 sequence# 4216 not archived, no available destinations
ORA-00312: online log 1 thread 1: 'E:\ORACLE\ORADATA\TESTDB2\REDO01.LOG'

Could anyone tell me how to fix this problem? Many thanks.