Regarding the player if you look at the options repair or replace you might find that is simply cheaper to just buy another player depending on the type /
model of the player. You can still find players for sale on ebay but if possible I would try and find one that you can pick up ,Ive had many players posted to me with mixed results and approx 50% arrived damaged. Once you have a working player you can then test the disc but to my knowledge once a disc is in poor condition and will not play it is not something that can be repaired.