I have a 4-year-old Dell Inspiron 545 desktop in which the hard drive failed a few days ago. I am trying to install a new Seagate Barracuda 1TB SATA HD and load Windows 7 onto it (Home Premium 64-bit version). However, I keep getting a message reading "No boot device available, Press ENTER key to retry." No matter how often I retry, I can go no further than this. Please help!