Hey body,

In the installation help of Forms6i is written that you shouldn't try to install the product in a home older (I guess) than 8i.
You have messed all of your Oracle 7 files.
You should try to uninstall all the Forms6i files and after that try to reinstall all Oracle7 products. I never did that but could work.
I wish you luck.
Valentin Mînzatu