So I bought a digital copy of GTA 5 from the marketplace. The game loaded to the ingame download screen where it started to download Install Packs 1-4. When the packs finished downloading and I tried playing, I got the "This disc is unreadable" error. But when I delete Install Pack 4, (Or known as gtav - part3 in storage/hard drive) I don't get the unreadable disc error and I get sent to the in game download screen to download the Install pack, but when the Install pack is downloaded again, I get the disc is unreadable error again, what can I do to fix this? And has anyone else had this problem and fixed it?