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You don't necessarily need net config assistant or net manager to run as all they do is generate text files (tnsnames.ora and sqlnet.ora) for you.
If you have a tnsnames.ora file and sqlnet.ora file from a different installation you can probably just copy/paste them into your %Oracle%\network\admin folder and see if that gets you going.
To remove the Oracle software and restore the machine to a 'clean' state if you want to retry the installation is a bit of a hassle because it involves manually cleaning out the registry, your PATH environment variable, etc. However, if you have access to My Oracle Support, the following note walks you through it:
Note 124506.1 How to Remove the Oracle Client Software Before Reinstalling
Hope it helps,