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					Originally Posted by  Itshim
					 
				 
				Have had to reformat the whole system when using a recommended `free` antivirus caused major problems . So rather go for overkill    
			
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 As someone who considers himself an enthusiastic expert the only time I have had catastrophic issues caused by an AV itself was the paid for version of Kaspersky. 
As an addition to this thread as it is about computer health I cannot recommend Backupper or similar programs  that will take a system image that can be recovered in minutes enough
Say for example you had a working system backup from say a week before the AV stuffed things up you recover to that and the system is back up and all set up without the hassles of a reinstall and having to set everything back up again 
Windows 10 still I believe has the old windows 7 system backup options hidden away somewhere too