Hi,
I don't think there is problem with the HP box(I hope it's HpUX 11.0), try checking the init.ora parameters. If you are capable of working without the dbassist utility using the scripts crdborcl.ora and crdb2orcl.ora then pls use them so that u can very easily identify the error which occurs. Also pls let me know the exact error which occurs during the installation. Check the log files

Rgds
Ganesh .R