I think there is way in 8.1.6 to do it.
it is through using the Responsible files. '*.rsp'., located on the cd.

you have to first customize the entries in the response files, one of the parameters in responsible showing and not showing the windows.

Replace the original response files with the customized response files in the same directory.

then type in

$ORACLE_HOME\install\orainst.exe
/silent /prd y:\install\nt.prd /install ntinstall
/rspdest y:\installernt.rsp

and the machine will perform the silent install.

-skasu