I have backed up drive C win xp os to a usb external hd with Acronis trueimage delux and when i try to restore it says cannot because drive C is in use and says close programs or reboot. When i click reboot a box says "Failed to write to the sector 0 of the hard disk 1"
When you open Acronis, and click restore, doesn't it ask you where you want to restore from ?. I know it's a bit late in your case but the most efficient and reliable wat is to use Acronis Secure Zone that way you can restore by hitting F11 on boot. I use both methods but with no problems. You are probably better off contacting Acronis as anchor suggests.
Just to clarify,when you open Acronis Restore Image make sure that the HD that you have stored the backup on is shown in the right hand pane.If it isn't scroll through the left pane until you find it and click on it. I think you may be trying to restore from Secure Zone which is not there, because you haven't made one.I hope this helps.