DVD Decoders

One of my uncles had a problem on his computer. So he had to erase everything and then re-install everything back but when he re-install back, he had another problem but this time is with his dvd player. It seems that he did not have a dvd decoder installed. So I started searching for deals on dvd decoders and I found some and 1 of them is on nvidia website they cost around $19.95 to $59.85.