How do I re-install iPhoto 9.2.2 in Snow Leopard?

[Freeþinker]

A day or two ago I responded to the Software Update prompt for the latest versions of both iPhoto and iTunes, but now my iPhoto won't even launch. Should I re-install iPhoto and start all over again? How do I do that if App store already says that I can't re-install something that's installed?

Here's the problem report:

Process: iPhoto [1709]
Path: /Applications/iPhoto.app/Contents/MacOS/iPhoto
Identifier: com.apple.iPhoto
Version: ??? (???)
Build Info: iPhotoProject-629040000000000~1
Code Type: X86 (Native)
Parent Process: launchd [120]

Date/Time: 2012-03-09 19:37:36.398 -0500
OS Version: Mac OS X 10.6.8 (10K549)
Report Version: 6

Interval Since Last Report: 1114512 sec
Crashes Since Last Report: 20
Per-App Crashes Since Last Report: 20
Anonymous UUID: 215B71B1-CEFC-4005-A4A6-CC3F51BDF986

Exception Type: EXC_BREAKPOINT (SIGTRAP)
Exception Codes: 0x0000000000000002, 0x0000000000000000
Crashed Thread: 0

Dyld Error Message:
Library not loaded: /Library/Frameworks/iLifeFaceRecognition.framework/Versions/A/iLifeFaceRecognition
Referenced from: /Applications/iPhoto.app/Contents/MacOS/iPhoto
Reason: image not found

Binary Images:
0x8fe00000 - 0x8fe4163b dyld 132.1 (???) <4CDE4F04-0DD6-224E-ACE5-3C06E169A801> /usr/lib/dyld