Trouble installing NIOS II EDS. Keeps telling me to check QUARTUS_ROOTDIR

Every time I start NIOS EDS setup, I get : "You need an installation of Quartus II / SOPC Builder 9.1 or later to install this kit (you have 10.10 at C:\Altera\10.1\quartus; check QUARTUS_ROOTDIR environment varialble)." See attached images for screenshots.

I can't figure it out. Can anyone help me?

Thanks,

BiggyD