Anti virus download shut my computer down

Hello Shane,
We regret for the inconvenience caused. We have sent you an email containing the password reset email. Please try to reset your password using the link on the email and check whether you could able to login into your AVG My Account.
Thank you.

When I downloadede the AVG anti virus it shut down my pc & now I can't get past my password in both of my accounts on my computer, because it tells me I'm entering the wrong password. Which has been the same password i have entered for 3 years.  Why has this happened to me & Why is this my 2nd email to use with no reply, what so ever

Hello Shane,
We regret for the inconvenience caused. We have sent you an email containing the password reset email. Please try to reset your password using the link on the email and check whether you could able to login into your AVG My Account.
Thank you.