About a week ago I noticed my passwords weren't working right, like someone was watching them. I installed an antivirus but it's not finding anything. What else can I do to figure out if I've got a keylogger on my computer?
I'm not entirely sure it's a keylogger, because modern antivirus software usually detects them pretty well. It's more likely you had your accounts directly compromised (someone stole your credentials from another site) or fell for phishing, so first thing would be to change all your passwords from a clean computer, enable two-factor authentication everywhere, and check the recent activity on your important accounts to see if there are any weird logins.
If you really suspect malware, run a scan with Malwarebytes in safe mode, format the drive if you have important backups, or take the computer to a technician who can do a deeper analysis with forensic tools.
If your antivirus isn't detecting anything but your passwords are suddenly failing, someone has probably already accessed your accounts directly - not necessarily through a keylogger. First thing is to change all your passwords from another device you trust (a clean phone or a friend's computer), then check the recent activity in Gmail, social media, and email - most services show you where they were accessed from. Also run a scan in safe mode with your antivirus, even if it sounds cliché; sometimes malware only activates in the normal session. If you keep seeing weird activity after changing your passwords, that's when you should consider doing a more aggressive cleanup or formatting your system.
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