thank you all, much appreciated, you've been very helpful, especially NavyLCDR and steve108

yesssss I've done it, created the EFI partition and done the bcdbboot stuff without any errors.

Rearranged the booting order and all looks okay

NavyLCDR
entered the code you provided. I can see the new EFI partition on Disk3, 100MB Healthy (EFI) System Partition.
I get an error when doing the bcdbboot bit: "failure when attempting to copy...

steve108, I've taken your advise and created an image with Macrium Reflect. I have noticed it has taken the EFI partition from Disk4 and the Win10 partition from Disk3 which is what I want.
Being a...

Does it matter where the EFI partition is located. It usually appears to the left of the Windows partition.
If I shrink the Win 10 partition on Disk 3 to accomodate the EFI partition, it will end...

steve108
It was a migration from Disk3 to Disk4 so obviously I couldn't disconnect any drive, I then decided to stick with Disk3 .

I've ended up with this, the atatched image of Disk Management, don't ask why:
349340
I want to move the EFI partition from disk4 to disk3.
Disk3 is the WIndows 10 installation I use but I want to...

It's on an SSD and I've checked for file corruption and all is okay, so as you say a clean install of windows may be necessary. For now I can do without microsoft store, everything seems to work...

Brink,
I did a windows repair install but problem still exists
microsoft store still does not appear in the Settings Apps & features list
It does appear in the Start list, when I try to open App...

Cheers, I will do as you suggest, thanks for the fast response and the welcome

tried re-setting, a repair install was my next option but thought it was a bit drastic so was trying to see if there was anything else I could try

microsoft store will not run. Shows on the start menu but not in Programs & Apps.
tried to re-register but get this:

268929