question:checking operating system version: must be 5.1 or 5.2. Actual 6.1 Failed.
Make Changes in following two files:
1. database\install\oraparam.ini : Change entry Windows=5.0,5.1,5.2,6.0 to Windows=5.0,5.1,5.2,6.0,6.1
2. database\stage\prereq\db\refhost.xml: Include a tag for 6.1 also. (Similar to 6.0)
It won't let the warning raised and the installation will work fine.