I tried to install Oracle 7.1 for windows on my Windows 98 machine. Installation was shown successfull. But logging in to SQL PLUS with Username/Pwd, Scott/Tiger was showing the error " ERROR ORA-12203 : (Cnct err, Can't get err txt. see Server Msgs & Codes manual) ". Could you please let me know whether i need to modify Oracle.ini file to create the Host String.