RWY 12 Install Question

I am about to install RWY12.
One of the downloaded programs needed from Microsoft is 'dotnetfx'. There are three versions, 1.1, 2.0 and 2.0 Beta1. Which version should I install?
Thanks
Ivor
One of the downloaded programs needed from Microsoft is 'dotnetfx'. There are three versions, 1.1, 2.0 and 2.0 Beta1. Which version should I install?
Thanks
Ivor