Try running the installer at a command line like this:
msiexec /l*vx genome.log /i Genome_011_46705_x64.msiAnd send the genome.log file to support@thinkboxsoftware.com.
It looks like you deselected the option to install the 3dsMax 2012 version of Genome, but it tried to add an entry in the plugin.ini anyways. I will fix this bug, but in the meantime you can avoid the rollback by making sure to install both the Max 2010/2011 and the Max 2012 plugins in the tree list of installable components.