I get following error:ORA:12154 : TNS:Could not resolve service name.

Also i noticed in the registry the following:

software/ORACLE/ALL HOMES has 2 different homes. One for the version (HOME0)which has oracle db on the network and HOME1 which has the Personal Edition Oracle8i

Under software/ORACLE/ORACLE_HOMES , there is ONLY ONE sublisting that is ORACLE0 which is referring to the network version.

I suspect that that the reference is only to one Oracle_home although the Personal version is installed correctly with its own Oracle_home (HOME1) and respective attributes.

I don't know what to do ?

Thanks for your active help. I appreciate that.