Many issues involving Google Drive can be fixed by logging out, and then logging back in. Follow the steps below before troubleshooting further.
1. Right-click on the small Google Drive icon in your System Tray:
2. Click 'Quit' when the pop-up box appears:
3. Click on the Start Menu, then type 'Google Drive' and click on the 'Google Drive' app icon to re-launch the software:
4. You may need to SIGN-IN using your Google account credentials.
5. Confirm that the Google Drive app icon is showing in your System Tray:
6. Open your Google Drive folder and confirm you have access to your Shared folders.