[DanielG]

You do nothing.

To watch it on your PC, download a DVD Player application like PowerDVD - http://www.cyberlink.com/multi/products/main_1_ENU.html (30 day trial) or WinDVD - http://www.corel.com/servlet/Satelli.../1166553864549

If you don't want to pay for DVD playing software, then check out VLC Media Player - http://www.videolan.org/vlc/