iPhoto update, need help

I'm trying to update iPhoto 6, but neither the software updater nor the manual update will update my copy of iPhoto 6 to either 6.04 or 6.05. Software update gives me the following error:

Some of the checked updates couldn't be installed.

The digital signatures for this package is incorrect. The package may have been tampered with or corrupted since being signed by Apple.

When I try to manually update I get this error:

You cannot install update 6.0.5 on this volume. An eligible iPhoto application was not found in the location Applications/iPhoto.app.

I'm at a loss here on what to do. I've tried reinstalling iPhoto from my install dvd's and I do have iPhoto 6 installed as you can see from my attatchment. Any ideas on whats wrong here guys? I'd really appreciate some help. Thanks

 

Nevermind guys..I seemed to have resolved my own problem. Seems iPhoto 6.0.5 requires 6.0.4 be installed first. Found the needed updates and they ran without another hitch. Thanks anyway.