"image size could not be verified - operation not performed" when I go to restore to my hard drive. What do?

I want to restore my disk image using disk utility. I keep getting "image size could not be verified - operation not performed" when I go to restore to my hard drive. What do?
I would like to partition my disk but it says I have to restore my disk image first so that files can be moved. This is really obnoxiously hard for someone who is only moderately tech savy. Any help is appreciated, but please no links to 3rd party sites. I would like to keep this with the software I already have.
Thanks ^_^

Sorry nobody has replied yet, but how was this disk image made?
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.

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