LG DN788 ~Very Strange Behavior~Need suggestions

Ok, so I have had my REGION FREE LG DN788 for about 2 years~love it! The other night it just quit playing any other region but 1. I just got a new dvd from the UK and when I put it in, it says "CHECK REGION CODE"..HUH!!!!!!!!!!so I pulled out about 18 UK dvds, that I had "already" viewed in the last year and NONE of them played.....all said the same thing.
I called the company I bought it on line from and he was really nice..he said it must have become UNPROGRAMMED..have no idea how that happened, since the dvd player is stationary & never is moved..ever. Anyway he said he would send me a CD and I could re-program it my self, he said it was VERY easy to do. I was very excited 30 minutes ago when I got the CD, priority mail...not so excited when I put it in and it said CHECK DISK with that red triangle. I did check the book and it appears that model may not be able to read a cd file....I had never played a cd on it, so I threw a music cd in and it played, rather good(who knew?) so I am not sure what the &*^% is going on, and why the cd cannot be read...I put it in my computer just to see if I could read it...and windows said it was an UNREADABLE FILE...could not be opened. any ideas?????????????:mad::mad::mad::mad: