Wow, glad you posted that.
On my home PC:
OK, I deleted everything. DFX2.0, DFX3.0, and RR.
I disabled my McAfee, reinstalled RR. But it asked me to install in Program Files/RoadRunner, not Program Files/Road<space>Runner. I changed it to Road<space>Runner.
I then installed DFX3.0, and all works now. However, with the DFX install I noticed it asked to install into Program Files/Road Runner, not Program Files/RoadRunner/skins. I just clicked ok...it installed in C:\Program Files\Road Runner\skins.
I also did not get anything in my "Start> All Programs" menu. I went into the folder and created desktop shortcuts for RR and RR config.
Now...to try this on my carputer. I have no anti virus on it...different problem anyway.