UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36

Steps to reproduce the problem:
1. Open Google Hangouts addon in chrome
2. receive the error hangouts.google.com didn't accept your login certificate or your log in certificate may have expired
3. 

What is the expected behavior?
Expected that the google hangouts should bring up my chat contacts in the pop up window from the bottom right of the screen.

What went wrong?
receive the error hangouts.google.com didn't accept your login certificate or your log in certificate may have expired

Did this work before? Yes A few weeks ago

Chrome version: 53.0.2785.116  Channel: stable
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 23.0 r0

My google chrome browser has been kind of slow and laggy lately, not sure if that has anything to do with it either.

Thanks for your help!