Computers have become slow since installing Norton 360 Deluxe

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1

Since installing Norton 360 deluxe a couple of weeks ago on our computers they have become impossible slow. I have done all the obvious suggested solutions. The computers are 3-4 years old running Windows 10 and using Google Chrome. Is there any solution?

[Edit: Clarified subject]

 

2

Is this the first time you installed Norton 360 on your computers? If so, did you fully remove any previous non Norton security product using the removal utility for that software?