Dual O/S - Windows not booting

I have had my Dual O/S Hi12 for a few years now. I tried to update the Windows O/S via an external drive. That crashed during installation. Now windows doesn’t run and keeps asking for the external drive. Which I had to format because of the crash during installation.
Is there a service center in the UK where I can send my laptop to as this is beyond my comfort zone to repair this now!