That's a strange request. Any DVD-player connected to the TV will be able to play DVD's. No need at all to use a PC for that.
But if you're sure you prefer a PC to a DVD-player for some reason you didn't tell:
1. Use IMGBURN to make an iso-file of the DVD
2. Connect the TV to the HDMI-out of your PC
3. Use VLC media player to play that iso file.
No need for any time-consuming and quality-lowering conversion. The software is free, the HDMI cable isn't.