Cartes Du Ciel
http://www.stargazing.net/astropc/download.html
You may need the ASCOM drivers - easy to install here
http://ascom-standards.org/downloads.html (take the base platform and the Celestron drivers)
PHD
http://www.stark-labs.com/downloads.html
Or grab the beta 1.5.1
http://www.stark-labs.com/depot/beta...uiding_151.zip
Hope that helps!
If you want to auto-guide or remote shutter control or remote focus control - highly recommend Shoestring astronomy's products
http://www.store.shoestringastronomy.com/index.htm