Howard got a used computer from work and he's getting a popup when he checks into his email asking for his user name and password on Gmail. If he replies, it doesn't take it and he gets a note from Google someone has his password.
Leo says that two factor authentication could solve this, but he should clear out all his settings. There may be an Exchange server still attached for the email settings in Outlook. Leo also says to check his date and time. It's possible that the time and date is not accurate since it's an older computer and that's causing an issue.