Are you sure you had a successful installation? Did you check the installation logs for errors?
I don't think there's any way that having a wireless network would impact your
ability to connect with Oracle since the two operate at different layers of
the stack. On Windows systems, I've seen this error sometimes if the
sqlnet.ora file contains a line like this
"SQLNET.AUTHENTICATION_SERVICES=(NTS)". So, you may try removing that line
and see if your error message changes. If it isn't in your sqlnet.ora, you
may try adding it and see if that resolves your issue.
This was first published in November 2004