Two weeks ago I received an email that said that I had been hacked and I had a malware and they were spying me through my webcam and my keyboard. I saw the email one week later and did a factory reset on my phone and my PC. Later I changed all my passwords. But on tuesday I received an email from instagram from me to myself, it was the email when someone can´t enter to the account but I never tried to enter after I did the factory reset and I checked the Instagram app and the emails were officials from instagram. I have Avast and when I scan my phone or my PC it sais I have any virus but today I received the same email from Instagram. So I have a few questions.
1. Can the virus still be on my devices although I did the factory reset and Avast don´t detect anything? Because I´m really paranoid of thinking if they are watching me or they know what I write.
2. The instagram emails can be only a bug from when I changed the password or they are really trying to enter to my account?
Please help me because this is making me crazy.
PS: Sorry if my english is quite bad.