cannot install RHEL 6 due to missing or corrupt file!

I'm trying to install RHEL 6 via USB. After selecting Desktop environment I get the following message: udev-147.2.63.el6.i686.rpm cannot be opened. This is due to a missing file, a corrupt package or corrupt media. Please verify your installation source. Needless to say, I have checked sha256, redownloaded RHEL 6, switched to a different USB -- went out and bought a new USB, etc., etc... No luck... Any help would be appreciated folks. Thank you.