Hello, I have an Acer Extensa 4620z, the hdd went out on it, i replaced it and tried installing xp on it cuz i dont have the vista recovery disks but I get a "setup did not find any hard disks drives installed in your computer" message. I also tried windows 7 as well but I get a "no os found" message. My understanding is that this laptop was designed only for vista and not xp, so I'm thinking I need storage drivers for it. Any help with this would be greatly appreciated.