what spyware/malware do when it gets installed on your computer nowadays

1. The first task after its installation will be ask you to update when you do so the update will  start to run withfull bandwith (like bullet) then hangsup this is when the spyware starts to do its jobs during the hangup session it is not actuallly waiting for data from rather  it search for the information from your computer and updates to server on background .

2.A sudden prompt requesting that you got affected with virus and you got some files deleted on your system click here to backup or restore ,actually this kind of virus will delete some data from your system which will then affect your system's speed.

3.Clicking on nonapproved site ads which will install spyware on the victims system and start to add bytes and bytes of junk data to victims main memory which reduces the speed of computer slowly with out knowing what is  the reason for happening.

 every thing should be avoided user can use parental control options

 Installation only certified apps from certified authorities 

keep your antivirus updated 

If possible check for the security issues mothly once 

do backups often