It seems there's a hidden Admin account which you have to enable, Clive, and one method I found is this:
Using the Command PromptFirst click Start. There type CMD into the search bar. Right click on it and select Run as Admin.
Now, in there you will type this:
net user administrator /active:yesThis will enable the Admin account. So when you logoff you will see the Admin account listed as accounts that you can log into. There is no password set by default. So you don't have to worry about typing in a password. Just click the account and go.
Now if you wish to disable the account it can be done using the same method, with the code:
net user administrator /active:no That will disable the account.
Hope that helps.