Having moved to Windows 10 Home, I later found my Samsung NP300E7A Laptop had been infected with esurf.biz.
Thanks to the very helpful information on this website, I believe I have managed to remove it and many other cookies etc.
I used several different apps recommended by the site and end with FarBar. In the Additional.txt file it generated I find there are several "old" accounts still in memory:-
Administrator (S-1-5-21-578327087-4110603385-1361986703-500 - Administrator - Disabled)
ASPNET (S-1-5-21-578327087-4110603385-1361986703-1005 - Limited - Enabled)
Ben (S-1-5-21-578327087-4110603385-1361986703-1001 - Administrator - Enabled) => C:\Users\Ben
DefaultAccount (S-1-5-21-578327087-4110603385-1361986703-503 - Limited - Disabled)
Guest (S-1-5-21-578327087-4110603385-1361986703-501 - Limited - Enabled)
HomeGroupUser$ (S-1-5-21-578327087-4110603385-1361986703-1009 - Limited - Enabled)
Of these only ASPNET and Ben show in the Account Settings page.
It seems Windows 10 Home does not have "Group Policy" so I have been unable to find a way to delete the old accounts.