[Solved...] Docker update failed - please help this newbie

Hi Folks,
Complete newbie here, so apologies if I am not explaining this properly.
I use WebODM Manager, on a Windows 10 machine, and all was good until I got a message to update Docker.
I accepted this, but the update failed (because a file was in use).
Nett result was that the whole contents of the Docker directory in C:\Programs was deleted by the update process (all files).

I restored the Docker file directory from a backup, but now when I try to start WebODM / Docker, I get the following message:
Backend service is not installed
at Docker.WPF.BackendClient.CheckService(String action) in C:\workspaces\stable-18.09.x\src\github.com\docker\pinata\win\src\Docker.WPF\BackendClient.cs:line 291
at Docker.WPF.BackendClient.SendMessage(String action, Object[] parameters) in C:\workspaces\stable-18.09.x\src\github.com\docker\pinata\win\src\Docker.WPF\BackendClient.cs:line 167
at Docker.WPF.TaskQueue.<>c__DisplayClass19_0.<.ctor>b__1() in C:\workspaces\stable-18.09.x\src\github.com\docker\pinata\win\src\Docker.WPF\TaskQueue.cs:line 59

I I tried looking for the service in Windows Powershell, with this result:
PS C:\Users\mike> Get-Service com.docker.service
Get-Service : Cannot find any service with service name ‘com.docker.service’.
At line:1 char:1

  • Get-Service com.docker.service

So… can I simply download the Service (and from where??), and install that, or should I do a full System Restore of my C drive, or should I just reinstall Docker For Windows (and if so, how???)?
I don’t want to lose any maps I have already created in WebODM… Will re-installing Docker remove these previous maps??? Are they stored in WebODM or Docker?
If I must lose these previous maps, then so be it…

thanks for any help.