Dyou mean where i installed my Oracle software, if yes then c: drive. not sure what if thats what u mean?

Would you know what causing an error when I get an ORA-12514: when i connect as conn sys@orcl as sysdba and via the web?

This worked for me

output in comman prompt.
=========================================
C:\>net start oracleserviceorcl
The requested service has already been started.

More help is available by typing NET HELPMSG 2182.

C:\>set ORACLE_SID=orcl

C:\>sqlplus sys/sysdba as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Sun May 13 17:26:41 2007

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


Connected to:
Oracle Database 10g Release 10.2.0.1.0 - Production