Your Backup and Sync enables you to log in, but in the next second you have been logged out.
(This error came after Windows 10 October 2018. upgrade.)
Go to Task manager and stop the Backup and Sync process (GoogleDrivesync.exe).
Right-click it and select End process.
Type in %UserProfile%\AppData\Local\Google\ an Explorer window.
Locate any folder called "Drive" and rename it to Drive old
Reboot your machine or simply start Backup and Sync
Google Drive Help Forum 1.
Google Drive Help Forum 2.
Symptom: HP LaserJet Pro 400 M401dn (CF278A) printer has a "79 service error Turn off then on" error message. Then continuously reboot and initialize. Solution: Switch the printer off from network, power off and on, reboot. If the problem is terminated, then clear the affected PC's print queue because there must be a workstaton which continuously sending a wrong printing job to the printer.
If you don't trust in the downloadable file above then run a command prompt with admin rights, write next commands and run each:
net stop spooler ping localhost -n 4 > nul del /q %SystemRoot%\system32\spool\printers\*.* net start spooler ping localhost -n 4 > nul