#1
I opened 2 emails saying that someone had been on our bank acount both from 2 different banks which my parents do not have a bank account in. I didn't click on the links they said i should go to, but by openeing the email my computer is know probably infected.

I ran SOPHOS anti virus it came up with nothing detected byut i do have 2 virus/malwares in the quarrantine bit.

What should i do?
#3
The link is most likely to a fake look-a-like page where you enter your bank details to login, and from there they get your info, basic phishing attempt.
#4
Banks don't contact you via email in those circumstances. The fact that the contact is by email(and by the fact that they're from banks you don't have accounts with) tell you it's a phishing scam.