It is possible to install the Cartes du Ciel-SkyChart version 3.0 over a full Windows version 2.76 in the same directory, and run the Cartes du Ciel-SkyChart 2.76 version apart from the 3.0 version. But you can also install the 3.0 version of Cartes du Ciel-SkyChart only.

Run the installer file skychart_3.xxxxx.exe, to install Cartes du Ciel-SkyChart in your prefered directory (i.e. C:\Program Files\Ciel)

At any time you can start the version 3 with skychart.exe, or the 2.76 version with ciel.exe

Only a limited number of telescope are natively supported.
To work with a full range of telescope model you need to install the ASCOM platform and the required telescope drivers.

Video recording require the ffmpeg software.

You can get a ready to install version for Windows from a number of place:
http://www.videohelp.com/tools/ffmpeg
http://sourceforge.net/projects/mplayer-win32/files/FFmpeg/
http://ffmpeg.arrozcru.org/autobuilds/

You can install the files anywhere you want but be sure to set the location of ffmpeg.exe in the menu Setup / Date-Time / Animation.