Use the link below and follow all of the steps to uninstall the app. After that, download and run the Revo Uninstaller mentioned in the article.
Hope this helps.
I have a Windows 7 PC. I used Google Drive until they told me it was ending and to switch to Google Drive FS. I did so. Now, I am getting messages that Google Drive is no longer synching and I should upgrade to FS. I deleted Google Drive, but I'm still getting the messages. How do I stop them?