Uninstall Comodo problem

I am trying to install Comodo v 2.4 again as v 3 slowed down the shut down time on my Acer laptop considerably. I have used the automatic uninstall from Windows and deleted any folders with Comodo named on them, but I still get Comodo is still installed on your copmuter - do you wish to uninstall it? I have searched the computer and cannot find anything to do with Comodo so why can’t I install v 2.4?

Help please!!!

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