Seems installer is currupted. .
Are you trying to run setup directly from zip?
If so, then first extract in folder then try to install.
If you try to install from pen drive, then copy setup on HDD before trying again.
IMO the Oracle database config assistant is an optional tool. If you did not get any other error except this one, then I presume Oracle has been installed properly. This additional accessory has somehow failed to install / load most likely due to file being corrupted.
You can also try running the same while closing all other programs like antivirus, firewall any other online messengers, winzip agents etc if they are scheduled to auto start.