Nearly every time i boot up my computer i get a black screen message saying you have a disk read error please press ctrl+alt+del to- restart your computer. After doing that sometimes it just works and boots windows up and other times it asks me to select windows 7 as my OS. I don't know if this is the problems but it says booting from cd drive when i have installed windows already and changed the first boot drive to my hard drive with windows on. Please help this is really annoying !