I have a Sony Vaio PCV-rz30cg computer that hadn't been used for some time and decided to put it back into use. I couldn't get Windows to load, and since I had no data on the computer that I needed to recover, I reformated the hard drives to reinstall Windows XP. I couldn't find my original disks, so I bought a new XP disk. When I did the install, I got an error that says that no signature is present, the data is invalid, and has the error code 800b0100. Advice?