Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
Can you try to retrieve your password, as if it were forgotten? using the 'Forgot your password?' link on the login page for Gmail ?
(Or is the account not your GMail account? if it is some other account?)
What 'note' said so? was it an email?
Or was it a popup ?
A popup or an email of that sort can be completely bogus, completely fraudulent.
If it were an email from GMail's notification system themselves, that would be different.
Did you enter a password ***** that popup? or any information, that it perhaps prompted for?
That's bad news. It was a popup? they often prompt fraudulently for a password, to get you to divulge news or info that is private to you and vital to your account.
This is called a 'phishing' scam.
Can you still access your GMail account?
If so, change its password ***** something you can remember and type in for sure.
Then log out of your GMail account, restart your computer, log back in.
See if that works, firstly (if your GMail account password ***** been changed already - fraudulently for sure if so, given what you have said - then it won't change again for you, I doubt.)
It is necessary to secure the security and continued access of your account ... that popup was NOT normal, if it happened on a computer rather than a handheld or tablet device. So your account is in some hazard at present.
Let me know how it goes, please.
That's bad news. I'm sorry to hear it.
Try to recover your password, by the usual means.
Your Secure Remote Assistance request is still open to other Experts to take up.
Do you want a phone call, or do you want your computer remote-controlled by an Expert to see what is wrong, or something else?