Able to login with any password except true!

Yesterday, I downloaded and installed Oracle XE, but I came across the same issue on two separate machines (Windows):
C:\>sqlplus /nolog

SQL*Plus: Release 10.2.0.1.0 - Production on Thu Aug 19 12:48:06 2010

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

SQL>
If I try to connect and put the correct password, after about 10 seconds, I get the following:
SQL> connect sys
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
Put in a wrong password also fails:
SQL> connect sys/WRONGPASSWORD
ERROR:
ORA-01017: invalid username/password; logon denied
However, if I put a random gibberish in the < b > password and connect as SYSDBA (!) < /b >, it connects right away:
SQL> connect sys as SYSDBA
Enter password:
Connected.
SQL> select sysdate from dual;

SYSDATE
---------
19-AUG-10

SQL>
When I first met this, I figured it was a fluke, but have come on two separate concerns machines myself. I downloaded the installer separately for each machine, this isn't a question of a corrupt downloaded file. Any idea what the world is happening?

My only thought is that the first machine was used for development work on other databases and thus already has a directory c:\oracle\, complete with TNSNAMES.ora, etc. and the second machine recently had a prior installation of XE removed, but I don't know how one of these could cause this behavior. Help?

-David

By default Oracle uses the OS to connect SYSDBA authentication: http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/dba.htm#i1006642. If your Windows account is a member of the ORA_DBA group everything works as expected.

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