Which is the best free antivirus for windows 10?  

The Best Free Antivirus Protection of 2018

1. Avast Free Antivirus 2017 combines a great free antivirus with a surprisingly extensive collection of bonus features.
2. AVG AntiVirus Free has a new look, and some new technology,
3. Kaspersky Free offers full-scale malware protection
4. Bitdefender Antivirus has many useful bonus features.
5. Malwarebytes Anti-Ransomware Beta makes a great addition to your security arsenal.
6. Sophos is excellent in phishing protection test, and gives you remote management of up to three installations.
7. Comodo is a Perfect score hands-on malware blocking test.
8. Trend Micro Shield blocks unauthorized access to protected documents.

According to me the top 10 Best Windows 10 Antivirus Software 2018

Total AV - Voted Best Antivirus 2018.
PC Protect - Fantastic Windows antivirus. Quick setup and simple to use. High protection level
Scan Guard - Protects Against All Malware, Viruses & Adware. Includes Free Cleaner & Optimize
McAfee - Mcafee is good quality Antivirus software, slightly expensive.
Norton - Norton is a trusted brand and been in antivirus for many years.
BullGuard - Good engine, Quite expensive considering the number of features.
BitDefender - Lots of products to choose from. Not the easiest antivirus to use.
AVG - Well known trusted brand, AVG is reliable and relatively easy to use
TrendMicro - Middle of the road antivirus, not overly expensive but not feature packed.
Comodo - Malwarebytes is predominately an anti-malware therefore slightly limited

Thankfully, there are many free antivirus for Windows 10 that users can download to protect their PCs and Laptops, from Microsoft Defender, AVAST Free antivirus , Malwarebytes, Trend Micro, Comodo and more. If you are looking for a long term solution, you have to upgrade to the paid version.