What works for me:
- Assumptions: The PC has an existing user account ("Account A") that
is already using Google Drive.
- Create another Windows user ("Account B").
- Log into Account B and set up Google Drive.
- Optional, but very useful: Share Account B's
Google Drive folder with Account A (share in Windows, not in the
Google Drive web app).
- In Windows, switch user accounts to Account A (do not log out of Account B;
doing so will stop Account B's Google Drive from syncing).
- [Optional] In Account A, map a drive letter to Account B's Google Drive folder (e.g., x:\ points to c:\users\Account B\Google Drive.[Only works if you shared B's Google Drive folder in step 4]
Now Account A and Account B are both syncing to their own Google Drive accounts, and you can access the local Google Drive folders for both accounts without leaving Account A (assuming you followed steps 4 and 6).
Note: whenever you reboot, log into Account B long enough for Google Drive to start, then switch to Windows user account A (again, do not log out of B or B's sync will stop).
I've been using this method with perfect reliability for over a year on Windows 7 and 10. The only drawback is having to log into both user accounts at startup.