Hi I've been trying to install Windows 7 Pro upgrade as dual boot with XP Home, and keep getting the message (something like) "Disk read error - press ctr-alt-del to restart" at the first boot during the installation process. Have checked the hard drive for errors, and there are none. Have replaced the hard drive with a brand new one, and get the same result. [I also tried installing Windows 7 Home Premium upgrade, and get the same result.] I have : Pentium (R) Dual-core CPU E5400 2.70 GHz Two SATA hard disks -- 500 GB & 1 TB (have been trying to install Win7 Pro on the first hard disk) DVD Multi drive 4 GB RAM Windows XP Home Help is much appreciated. Thanks.