I guess the easiest way I can think of would be to try the Software Update in the System Preferences to see if it comes up. Depending on which OS X version you are running the next system patch might help there as well, though I am just guess at this.
Do you have a back up of your drive? I guess that would be the easiest method, but I guess since you are asking that would be a no.
I am sorry if this doesn't work. The only thing I could think of is to do another system install but and use the system upgrade option that preserves your accounts and setting, but that seems rather drastic for recovering one application, though a crucial one.
I hope these work or someone else might have some better ideas.
PB G3 Bronze 333, Performa 580CD, Classic B&W(somewhere in the basement)
I did that however when I click to add a contact or view it just give me the thinking circle. When I switch to my back up start up disk it opens fine but when I go back to my hard drive it doesn't what I just said it does.
On your backup drive, you should go user/library/application support/address book.
Take the address book and copy it to the same location on your computer. If it says the directory already exists, overwright it.
Move down in the library on your backup and go to library/preferences/com.apple.addressbook.plist and copy that to the same location on your computer.
That should work!
"A positive attitude may not solve all your problems,
but it will annoy enough people to make it worth the effort".