Oracle Database Discussions

Hi friends,
I don't remember what I'm doing wrong:
- Windows XP Professional. Just installed in a formated pc.
- I've installed without any problem the Oracle Database 9.2.0.1 (form OTN download site). (It's been installed at c:\oracle\ora92
- Now, I want to install in the same PC the Developer 6i (Forms and reports builder 6i .
-When I start the setup, It appears a Window to choose Oracle_Home.
There's only one possibility: "OraHme92", with the location item (c:\oracle\ora92) disabled.
When I press the OK button, it appears an error msg:
"The location specified "c:\oracle\ora92" is already used as an oracle home for "oracle 82 Beta" It cannot be used as an Oracle home for 'nt' "

What does it means?? I don't have NT. I'm trying to install the "Oracle Forms Developer 6i Release 2 for 95/98/NT/2000/XP" with the 6i_rel2_xp.zip file
(http://download.oracle.com/otn/nt/forms/6i_rel2_xp.zip)

Thanks for your help.

Jose.