Apple released the new Mac OS X 10.10 Yosemite in the Mac App Store for everyone to download and install for free on October 16th, 2014, but downloading a 5+ GB file for each of your computers will take some serious time. The best thing to do is download it once and create a bootable install USB drive from the file for all of your Macs. This computer will no longer receive Google Chrome updates because Mac OS X 10.6 - 10.9 are no longer supported. This computer will no longer receive Google Chrome updates because Mac OS X 10.6.
Solved it! It was a combination of many solutions presented above, but I just had to put them in the right order:
I deleted the Google Drive File Stream app, emptied the trash
I reinstalled the app (still gave an error when trying to log in)
I went to the Finder folder Library --> Application Support --> Google.
I renamed the folder DriveFS to DriveFS.old
I was now able to log into the app, but it still gave an error accessing the files:
Google Drive Download Mac Os X
I then went to GO --> Utilities --> Terminal in order to overwrite the Gatekeeper
I entered: sudo spctl --master-disable
Then I entered my password (it’s not visible that you enter something, but the key strokes are noted)
After this I went to system preferences --> Security & Privacy
Under ‘Allow apps downloaded from’ the option ‘Anywhere’ was now visible and automatically enabled
Also, it now showed the text ‘System software from developer “Google, Inc.” was blocked from loading’. --> click 'Allow'
Google Drive Mac Os X Lion
Then when reopening the app, it would start downloading all my files.