Multimedia applications like Quicktime quit unexpectedly at launch, how can I get them to open?

Hello! I've been dealing with this problem for a few months and now it's finally crucial for me to find a solution.  After upgrading to Mac OS X 10.7.5 quite some time ago, some of my applications such as iPhoto, iMovie, MPEG Streamclip, and (especially) Quicktime quit unexpectedly as soon as I attempt to open them.  I've now downloaded Quicktime 7 since I'm needing to use that application and getting the same results.  I've read multiple other posts on the topic but none have resolved or directly related to my issue.  Thanks greatly for the help and insight.
Running OS X 10.7.5, 2.53 GHz Intel Core 2 Duo, 4 GB Memory - again, can currently only guess and diagnose that the problem started after upgrading to Lion and, thus, fearful of upgrading any more.

You can try running the combo updater over your install but I suspect you'll need to reinstall OS X. However, if you meet the requirements for Mavericks, I suggest you upgrade to Mavericks to fix this issue.
I suggest you test this by creating a second partition on your drive if you have enough free space. Open Disk Utility in Applications/Utilities to find how much free space you have available. Select Macintosh HD in the list. You'll see info at bottom of window.
Install Mavericks and/or Lion as a clean install. Boot into the new install and see if your applications open.
OS X Lion Update 10.7.5 (Client Combo) 1.91 GB
http://support.apple.com/kb/DL1582
You can reinstall Lion from the Recovery Drive.  Boot into the Recovery Drive by holding down Command R when restarting.
OS X Mavericks: System Requirements
To install Mavericks, you need one of these Macs:
          ▪          iMac (Mid-2007 or later)
          ▪          MacBook (13-inch Aluminum, Late 2008), (13-inch, Early 2009 or later)
          ▪          MacBook Pro (13-inch, Mid-2009 or later),
          ▪          MacBook Pro (15-inch or 17-inch, Mid/Late 2007 or later)
          ▪          MacBook Air (Late 2008 or later)
          ▪          Mac mini (Early 2009 or later)
          ▪          Mac Pro (Early 2008 or later)
          ▪          Xserve (Early 2009)
There are number of Macs that are limited to Lion 10.7.5.
MacBook 2.1, 3.1 and 4.1 
MacBook Air 1.1
MacBook Pro 2.1 & 2.2
MacMini 2.1
iMac 5.1, 5.2, & 6.1
MacPro 1.1 & 2.1

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