There is always the extreme measure: go into the registry and delete
every reference to the program and/or the camera.

Not for the faint-of-heart.

For somebody that is ' not a computer person ' you seem to know a lot.
You know where to find an uninstall.exe file outside of Control Panel.
That means you know your way around using Explorer and you know about exe files.
And then you ask " What is the Context ????"
It's strange how you found this exe file in the Common Files/Canon folder. My Vista doesn't
have a Common Files tree.

Nice try.
.

Hello Helen,
Sorry if I confused you. Calm down. Here is a new link that will take you
right to the "how-to" of Method One.

http://www.vistax64.com/tutorials/112795-context-menu-take-ownership.html

Now, when you're are there, ignor the "related links" , "note" etc., scroll
right down to HERE'S HOW.
1. Click   " A) Add_Take_Ownership.reg"
2. A popup window will appear, click RUN
3.Just follow the instructions. If you're prompted (asking if you want to
go on, click Continue). If you get a warning and ask if you allow or not,
click ALLOW. The rest is justing following instructions.
When installation is done, open the program you want to removed, RIGHT
CLICKon it, you'll see a popup , choose the column that says "Take
Ownership". Now you can start removing the file.
You can remove/uninstall any program/file/folder using this method if you
run into a similar problem. Just to be clear : the option is now installed
in your computer. You do Not have to go back to the link again.
Let me know if it's ok now.