It wont open and now I cant delete it

I installed it and went to open it and the app asked me if I wanted to upgrade. I clicked no and it dissapeared off of my screen. I went to the apps and tried to open it and it wont open. I tried trashing it and it wont delete because a little window pops up saying I cant delete it because its open…..but its not open at all. I just installed a useless app that I now can not get off of my computer! Hey, I hear it works great for some people though. Good for them, cheeeeeeze face

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