How do I uninstall unwanted program or go back to a previous state?

I have a Canon MP640. I found a Mac install dis that I didn't realise I had
I tried to install. It reported that it failed 
Now I notice some scan program icon on my top bar
I dont want it
I can see it in the applications folder
+ I have no idea what else might have been installed (even though the install said install had failed)
1. How do I uninstall?
2. How do I go back to a previous state? I only tried installing yesterday and nothing else has been installed since
Thanks
Omar

See: https://discussions.apple.com/thread/2444988?tstart=0
and: http://kbsupport.cusa.canon.com/system/selfservice.controller?CONFIGURATION=1011 &PARTITION_ID=1&secureFlag=false&TIMEZONE_OFFSET=&CMD=VIEW_ARTICLE&ARTICLE_ID=52 377
and: https://discussions.apple.com/message/8942824#8942824
So, if you see it in ->System Preferences->Users & Groups->[Login items], before you remove it with [-], control-click (right-click) the item and select Show in Finder to see where the program is located.

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