Hm... Try to install with internet connection off so he does not try to update.
Try different angles on your PS3 (standing, lying ...)
Try a different game disc.
If that doesn't help, no idea
Sorry to hear that buddy
Read at other places that the issues might be caused by the lates PS3 update. Some are reporting that they did start having problems after they updated the PS3 system... That is my last guess
The older ones are harder to get running but I cleaned it, made sure I had at least 50 percent memory free, and then uninstalled the game, re- installed it and disabled auto save and it worked.