If you didn't have, you should consider install one, even one of the free products.
If you did have, please share more details, since maybe there's a product or configuration others also have and it is inefficient.
Thanks for sharing this experience.
I do have antivirus which is Kaspersky Internet Security but it was disable because it blocks one of the bitcoin faucet that i always access to.
never disable your antivirus especially on a faucet site.
if you really want to access a site that is blocked, just learn how to add it to the exclusion list of your antivirus. and every one of them have something like that although you should make sure the URL is safe and then add it.
this may help you: https://support.kaspersky.com/5418