You've tried it another computer?, Tried another disc in your computer? The fact that the pc won't boot when it's in suggests your pc is set to boot from dvd/cd rom and is reading it as a disc.
Haven't got any other computers to try it on, poor boy me lol
Other disks work fine in the machine and in both drives, How do i change my computer to not boot from a cd?
Bearing in mind its only this disk that makes it play up any other disks in it it doesn't affect it :S
DVD player wont read it which is because i'm assuming the DVDs on the disk arent .avi
Edit: its now reading the disk, just blank