It really depends where you bought it from. If it is a pretty decent site like Amazon, you probably can get it replaced. Another option is going to an electronics store and buying a scratch repair kit.
How do we get parental block off the tv we bought it used
It can already be bought on DVD.
No. It has to be replaced.
Broken electronics are often easier to get replaced than repaired.
it might work on a blank DVD-r - but not on a shop-bought DVD
Cars 2 is out on DVD in November 2011.
The movie 'Heat' can be bought on DVD from most large DVD retailers although some may need to order it in if they do not have it in stock. It can also be bought from Amazon.
finding nemo
blu-ray
There are many places where one can purchase Disney's 'Cars' on DVD. This includes multimedia stores at stock DVD's, the online Disney Store and other sites such as eBay.
One can purchase a Lord of the Rings DVD from a number of stores or online retailers. They can be bought from Amazon, ebay, Walmart, Target and Best Buy.
If the DVD is Read-Only (If you bought or rented it with the movie already on it), then no, it can't be changed in any way by the computer