You will need to use the ghost tools (specificaly the ghost boot wizard) to make a bootable cd or USB thumb drive.

Steps to make a boot disk are found here.
http://www.symantec.com/docs/TECH110134


With the Ghost Boot Disk created per the instructions above, connect your USB device and boot the computer you wish to deploy an image to with that boot disk. This should boot you into Ghost.

Once you get into Ghost, take the following steps to deploy the image locally:
1.Click OK on the informational Ghost screen
2.Click Local
3.Click Disk
4.Click From Image
5.Browse and select the image you wish to deploy and click OK
6.Select the destination drive (usually Drive 1, though make sure the drive you are restoring is the correct model and size).
7.Click OK, and proceed with image restoration.