The windows Defender is the the default antivirus application των Windows 10. Παλαιότερες εκδόσεις των Windows, όπως τα Windows 8.1, Windows 8, Windows 7. Τα Vista, διέθεταν επίσης την εφαρμογή αλλά τότε ήταν λιγότερο αποτελεσματική καθώς αναζητούσε μόνο spyware και adware.
In Windows 8 and Windows 10, Defender is application-based Microsoft Security Essentials, η οποία προσφέρει καλύτερη προστασία προσθέτοντας πλήρη προστασία από κάθε είδους κακόβουλα programs. 
However, if you prefer to use some alternative to protect it computer you may want to disable Windows Defender. Below we will see how you can disable Windows Defender permanently.
Open the Notepad (or text editor), copy and paste the following text:
Windows registry Editor Version 5.00 [HKEY_LOCAL_MACHINE \ SOFTWARE \ Policies \ Microsoft \ Windows Defender] "DisableAntiSpyware" = dword: 00000001 [HKEY_LOCAL_MACHINE \ SOFTWARE \ Policies \ Microsoft \ Windows Defender \ Real-Time Protection] = DisableBehan "" DisableBeha00000001 " dword: 00000001 "DisableScanOnRealtimeEnable" = dword: 00000001
In Notepad, press Ctrl + S or from File in the menu click στο Save. Θα ανοίξει το παράθυρο διαλόγου της Αποθήκευσης. Εκεί, αντιγράψτε-επικολλήστε το παρακάτω name along with the quotes: “defender.reg”. The quotes will ensure that your file will have the extension “.reg” and not be saved as .reg.txt.
Save the file anywhere you want.
Right after that you can double-click the * .reg file. you created. Confirm the UAC question and click Yes to add it to the Registry. Then you will have to restart your system.
Below you will find the files for the Registry. Also included is a file that will help you restore the application if you ever need it.
The zip file contains the disable.reg που θα απενεργοποιήσει την εφαρμογή και το αρχείο restore.reg που θα την επαναφέρει αν κάποια στιγμή την χρειαστείτε. Μετά από κάθε εφαρμογή των αρχείων το σύστημά σας θα χρειαστεί επανεκκίνηση.
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I do not know how effective it is (so all Antivirus is effective until you get the virus), but it does not bother me at all. He does his job quietly and does not blame you.