Final Cut Express HD 3.5 Quits unexpectedly while opening

Question

Hi all. I have Final Cut Express HD 3.5. I bought it several years ago and used it on my Mac Book Pro (2006 model). I bought an iMac a few years later (December 2009). I can't remember what OS the iMac came with, but it's currently running 10.6.8.
I recently was asked to collaborate on a video project, so I installed FCE to use on the project. The installation went just fine, and the software didn't seem to disagree with my system, nor the system with the software.
I then went to open* FCE, and got the following error message:
"Final Cut Express HD quit unexpectedly while using the Impromptu Analysis plug-in."
*Note: this is the first time opening the software on this computer after the first time installing it on this computer.
Here is a shot of the loading/splash screen:
It tells me that while loading Audio Filters, It comes across a "MOSO: Impromptu Analysis" and somehow doesn't like it.
Live type and Sound track both seem to work fine.
THINGS I HAVE TRIED:
1. the first thing I did was a search of my computer for "Impromptu Analysis," and found a .component (I think) plugin. it wasn't in the traditional audio plugins folder, but within a folder containing the application (Impromptu) in my documents folder My first instinct was "get that thing out of here!!" so I deleted it. problem not solved.
2.  Did a complete software update of everything, verify and repaired permissions, and still nothing.
3. uninstalled and reinstalled, and nothing.
4. Ran software update again.
5. reboots between each step.
6. Bid on Final Cut studio 5 on ebay. I've since been outbid (but still watching like a hawk).
What I don't understand is even after deleting the plugin, rebooting and an uninstall and reinstall of FCE, and it's still messing with the plugin.
THINGS I HAVEN'T TRIED
1. upgrading to 4.0 (don't have a disc, and it's not available for a free update, since it's discontinued, is it?)
2. reinstalling the plugin that's causing the issue
3. deleting or resetting the preferences of the AU plugins list. (not sure how to).
my best guess on the problem plug-in is that it is part of an install of the live coding software called Impromptu (http://impromptu.moso.com.au/). But it's blowing my mind as to why it's still messing things up even after I deleted it. I don't think I ever did a proper install of Impromptu, nor did I do a proper uninstall...
If anyone can point me in the right direction, that'd be super swell.
Thanks!

Answer 1

Well never mind everyone. Apparently, Searching your computer for plugins through spotlight doesn't search the plugins folder in either the "Macintosh HD" location or the ~/Library locations.. Go figure.
I went to re-install the trouble plugin, and to my surprise, I still had 2 copies of the plugin installed on my system. I trashed them, as well as the other 15 or so of their brother and sister Impromptu Plugins, and got the software to open! now all I have to do is figure out what codec/setup to use.