Could someone please help.

I have just installed 9i personal on XP and had everything running fine. I.e able to create schemas, users, access SQL Plus use Oracle Enterprise Manager - everything.

I then installed 9i Developer Suite - now when I try and use any product except for SQL Plus, I get TNSListner problems. Usual error message is Cannot find it - Timing out problems. Even when I try and reconfigure the Listner using Oracle Net Configuration I get Time Out problem.

Any suggestions would be much appreciated