I have an Acer Aspire 5742 series laptop that the hard drive went bad. I'm in the process of purchasing another hard drive to intall, but understand that I will need to reinstall the Windows 7 operating system to get the computer up and running again. When I first got the computer new, I made 4 recovery discs (1-4), along with a disc called "AppDr1", a disc called W.7 64-bit, and finally a disc called Acer back-up. Does anyone know which disc I will need to load the operating system onto the new hard drive or will I need all of these? If so, in what order should they be loaded? The new HD will not have any e-recovery files, so not sure how this will work. Thanks for any help!!