Can't Stay Signed in to any Google Accounts with IE 11

Used to work fine, but now I can't stay signed in to any Google Accounts with IE 11 on just one of several Windows PCs:

Here's how I normally use my Google account. I set all my browsers to open tabs for Google, Gmail, Google Maps and Google Calendar at startup. I use Chrome, Firefox, Edge and IE 11. All latest versions. I set them all to remember login credentials so they login automatically and open the desired pages. All browsers on all devices work fine except on one device where only Google auto logins have stopped working correctly.
Starting in May 2016, on my primary Windows 7 desktop, every time I open a browser it opens the correct Google bookmarks but none are signed in. I have to enter my email and password each time by typing.. I stay signed in for the session but have to re-enter credentials if I close and open the browser.

ATTEMPTED RESOLUTIONS:
I have reset all browsers to factory stock and have painstakingly rebuild my saved credentials. I have used CCleaner aggressively to clear caches and other files.

What fixed my issue ONLY with Chrome was to turn off "automatically log in" and "ask to remember passwords," then clear cache & cookies, restart and re-enable those two settings. This made Chrome automatically log in to Google and Gmail, etc.

I changed Firefox settings so it automatically logs in to a family member's Google accounts and that works. But not with my Google account.

With IE I followed Microsoft instructions to reset and even to edit the registry to make the browser ask to save passwords again, which worked perfectly except with Google accounts. I often see the tab open on browser launch and briefly display the logged-in Google Calendar page, then flash to a default login screen. It's as if it instantly logged me out.

I am an advanced user and can’t find a fix despite searching the Web for weeks. . I don't want to have to make a new user account on Windows 7 or reinstall Windows to resolve this. Can anyone help?

I have a password manager but don't care to use it as it requires a login each session. My browsers all meet my needs in terms of remembering passwords and form data, EXCEPT IE 11 on this one PC where it has stopped working correctly. Any hints on fixing my issue?

Thanks, but I have checked and rechecked my Google account settings and IE Autocomplete settings. Everything is turned on, and autologon works fine on all my other computers with identical browser settings.

Hi, thanks for the reply but in my initial post, I wrote that I have already tried resetting and even reinstalling IE. Here's the quote:

"ATTEMPTED RESOLUTIONS:
I have reset all browsers to factory stock and have painstakingly rebuild my saved credentials. I have used CCleaner aggressively to clear caches and other files."

Any other ideas would be appreciated!

Trust me, I have no settings issue. All the settings on all my Windows PCs are the same for IE 11 and all save Google logon credentials and autologon except on one Win 7 x64 machine, like I said.

I never check "Delete Browsing History on Exit" so it is always unchecked and I always have all Autocomplete settings checked except for Feeds.

This is an unusual problem and I have tried every standard settings and reset suggestion 10 times. Any ideas?