This only applies to Windows 10
There seem to be many solutions to this problem but for me it was fairly simple – I just had to allow the App through my Firewall.
- Go to Control Panel and View by: Large Icons
- Go to Windows Firewall
- Click on the Text which says: Allow an App or feature through Windows Firewall
- Click on Change Settings
- Click on Allow another app…
- And Browse to: C:Program Files (x86)GoogleDrivegoogledrivesync
Once that was done it kicked in immediately and asked me to log in – after a few minutes items started to appear in my Google Drive folder.