I have a new drive (WD 500mb sata) which i have installed and it is configured as D drive. I wish to clone my current boot drive (WD 250mb sata) onto the new drive and configure it as the boot drive. I use XP Pro as OS. I made Acronis boot disc, booted to it, ran 'Clone Disc', and cloned the contents of my old drive (WD 250mb configured as C) to my new drive (WD 500mb configured as D). Directly following this, as computer shut down, I disconnected the sata cable to my old drive (WD 250mb), rebooted, checked in BIOS (which didn't recognise presence of old drive) to make sure I am booting to new drive and proceeded. During bootup, got a message 'error loading operating system' and couldn't go any further. This is the second time I have carried out this process. I can't work out what is going wrong. Any ideas greatly appreciated.