How do I correct wrong iTunes play counts? The play count in my iTunes library has somehow become incorrect. It shows some songs as never been played while I know that I have played them many times before. These songs do still have a "last played" date though. 

Also, some songs are being listed as only played once, while I know they have been played multiple times. 

I have an iPhone 4S, with iOS 6.0.1, iTunes 11. My PC is a VAIO running on Windows 7. I have a backup of my iTunes account. I think the problem started after I updated my iTunes account to version 11.

What I need is to get my original play count data back. Can anyone help me with this?
For minor play count screwups, I use a little AppleScript to set the count:

tell application "iTunes"
  activate
  set played count of track named "Vaseline Machine Gun" to 16
  return
end tell


Obviously this can be elaborated to handle more complicated situations involving multiple tracks and playlists.