Address Book 'Frozen' and Will Not Open

Question

My Address Book has completely frozen and will not open. Whenever I try to open the application, it just 'hangs' there, without actually opening. It was working fine only a few hours ago.
I've tried the following:
*Restarting my MacBook 3 times
*Restoring Address Book from Time Machine
*Deleting Address Book and reinstalling from the Leopard Installer disk
Nevertheless, Address Book will not open. Any suggestions?

Answer 1

I fixed the problem! I'm including the solution here, in case anyone else has the same problem.
It appears that my Smart Groups somehow caused my Address Book to freeze up. Unfortunately, you can't delete your Smart Groups while the application is open. Instead, try this:
1.) Close down Address Book
2.) Go to Applications/AppleScript/Script Editor
3.) Enter the following into Script Editor, replacing NAME OF SMART GROUP with the actual name:
tell application "Address Book"
delete group "NAME OF SMART GROUP"
end tell
4.) Click "Run."
5.) Reopen Address Book. This should fix the problem. At least it did for me.