You do NOT have to buy top notch A/V or firewall (on the other hand however somebody has to pay at some point)

I agree with Matt and Mario on regular use of Malwarebytes Anti-Malware - but YOU DO need to use it regularly don’t get lazy (pro or free one)

https://www.malwarebytes.com/mwb-download/

But not to disagree with Matt/Mario my reading of Windows 10 Defender is it's OK but in the middle of the pack and not my first choice for my Window 10 laptop and now desktop PC. I use different programs, a dedicated firewall, and Malwarebytes - and on my desktop I disconnect it from Ethernet when not needing internet or LAN for other assets anyway

http://www.howtogeek.com/225385/what%E2%80%99s-the-best-antivirus-for-windows-10-is-windows-defender-good-enough/

http://www.av-comparatives.org/comparatives-reviews/

most current A/V detailed test review summary from that org is Dec

http://www.av-comparatives.org/wp-content/uploads/2016/01/avc_sum_201512_en.pdf

and here are current tests

http://chart.av-comparatives.org/awards.php?year=2016

I don’t get emotionally attached to ANY A/V or firewall and have changed each a lot over the years, I check about every six months on what the different review labs have to report.

Good Luck [a SAFE and secure computer is 100% up to YOUR behavior].

Larry

Win10Pro,i9,64GB,2TBSSD+20TBHDDs,1080TI,BIAB'24,Scarlett18i8,Montage7,Fusion 8HD,QS8,Integra7,XV5080,QSR,SC-8850,SPLAT,FL21&others,Komp.14,IK suite&others, just a guitar player-AXE FX III &FM9T, FishmanTP, MIDIGuitar2, GK2/3'sw/GI20