Reset All Passwords
Don't wait to do this. Change the password on the hacked account, all associated accounts, and any other account which uses the same password or any variation of that password. DO NOT reuse passwords. Reusing passwords or changing it to something like your_name123.....not a good idea.
Run whatever anti-virus and/or malware programs to scan for any infected files or programs on your computer. Make sure these programs are up to date and that you are running the most recent version of your operating system.
Check for Backdoors
Good hackers will get you with backdoor programs that allow them back into your system, applications, or email even after you've done the steps above. Check your email rules and filters and make sure nothing is being redirected to another account you didn't set up.
Check your accounts to make sure your security questions have not been change. If things seem off, go through the steps of resetting security questions.
Most of the time, one of your contacts will let you know you been hacked before you figure it out after they've received a strange email from you. Once you know, send out an email to your contacts and let them know. You may save one of them from being hacked themselves.
Check Browser Extensions and Installed Programs
How to check web browser extensions varies depending on which browser you use. When you get to the extension page, double check that you recognize all the extensions. Some extensions are okay. An example is Google Docs. If you see something you didn't install or have no idea what it is, get rid of it. Don't just click disable, delete or uninstall it.
Once you've gone through these steps, refer to the blog on how to avoid being hacked at:
Blake Hanna, Realtor
The Pat Wattam Team