Yes, that works but then it loses all the previously imported images as if it is a totally new version.
Would prefer to be able to open the usual way without opening as administrator
Make sure the account you are logged on to your computer has full read/write privileges to all folders that are needed for LR.
Found if I did the following everything works again. It seems M$ includes a new user group with only partial privileges when updating to Win 10 and this new group needs to be given full control as with the Admin
Open the Program Files/Adobe/Adobe Lightroom folder.
Right-click on the Lightroom.exe file then Choose Run as administrator
Go to Pictures/Lightroom folder
Right-click on Lighroom Folder
Choose Properties > Security > Edit.Select your username in "Group or user names". and
Choose Full Control under Permissions.
Thank you to all who helped.