Using a PC to watch DVD's in HD

I just recently purchased a new PC and I want to use my old setup to play DVD’s on my TV. To give you my 2nd second bio, I’ve built probably 20 pc’s over the past 5 years. I have a ton of knowledge on PC components, overclocking, pc related software, gaming, etc but I don’t know much in regards to the home theatre setups.

I have a Samsung 61 inch DLP and I use a sony upconverting dvd player to watch all my dvd’s on right now. I’ve been copying them over to my spare PC to keep a backup and I like the organization that comes with it.

What software/hardware/cables do I need to take the DVD(VOB) files from my PC and be able to watch them on my TV in HD?