Connection to Oracle 8 from oracle tools

1. I had downloaded Personal Oracle 8 from the net and installed it in my pc.
2. i am having the follg problem
   1. i am able to access the database using

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      sqlplus 8.0
   2. i am NOT ABLE to access the database using

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      sqlplus 3.3 or any other oracle tools like developer 2000/discoverer 3.0 i am getting the following error when connecting from the tool " ORA-03121 no interface drive connected function not performed"
3. My sytem configuration is Pentium 32 MB RAM Windows 95.
4. I have checked the windows registery for the entries like plus33 etc..

Can somebody help me to get over this problem.

thank you in anticipation of a response

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