Dear Judith Malkin
Welcome to Microsoft Community.
We understand that you think your account has been hacked.
First, you can try to recover your account via this link.
How to recover a hacked or compromised Microsoft account - Microsoft Support
You can check your account activity history for unusual logins.
https://account.live.com/activity
Check the recent sign-in activity for your Microsoft account - Microsoft Support
It is recommended that you take the following steps to protect your account.
1.Change your account password. A strong password should contain at least 12 characters with a mix of uppercase letters, lowercase letters, numbers, and symbols.
There is an option to logout from all devices that you can run first.
How to sign out of your Microsoft account everywhere - Microsoft Support
- Turn on two-step verification for your account.
Two-step verification helps protect you by making it more difficult for someone else to sign in to your Microsoft account. It uses two different forms of identity: your password, and a contact method (also known as security info). Even if someone else finds your password, they'll be stopped if they don't have access to your security info. This is also why it's important to use different passwords for all your accounts. How to use two-step verification with your Microsoft account: How to use two-step verification with your Microsoft account - Microsoft Support
- Send your device for a security check for potential viruses.
I hope the above information is helpful to you.
Best Regards,
Peter.Y-MSFT | Microsoft Community Support Specialist