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It is likely that you have Windows Defender already installed on your computer.
Click on Start then Control Panel then View By: Small Icons
You should see Windows Defender at the bottom of the list. Is it there?
I am checking back up on your about your issue. If the issue is resolved or you do not need anymore help, please rate our session as 4 stars or more and press Submit so I am credited with helping you otherwise please reply back so we can continue with the issue.