I decided to give my acer aspire 5515 to my stepson, so i was reinstalling windows 7 on it and it accidently aborted before finishing installing. Now when I put my disc in it doesn't read it and never repairs it, never completes it, just keeps rebootiing. I have tried set up default settings, system repair, but nothing works. Please help. My drive is just making a whirring sound but never booting, but really it has always done that and would always eventually kick in, but not this time. I had an xp start up disc on a cd-r and it read that, but not my iso on a dvd-r.