I received email this evening from Avast which is self explanatory.
"The AVAST forum is currently offline and will remain so for a brief period. It was hacked over this past weekend and user nicknames, user names, email addresses and hashed (one-way encrypted) passwords were compromised. Even though the passwords were hashed, it could be possible for a sophisticated thief to derive many of the passwords. If you use the same password and user names to log into any other sites, please change those passwords immediately. Once our forum is back online, all users will be required to set new passwords as the compromised passwords will no longer work.
This issue only affects our community-support forum. No payment, license, or financial systems or other data were compromised."
I am knowledgeable about changing passwords, but username may be a problem for me even for this site.
Please advise if this notification is legit and the processes that I must undertake to change usernames, notwithstanding this site also.