I have rebooted, more than once but to no avail. This is what happened before the message, execute setup.exe tells me I need various things (IIS etc) so I get them, then by accident I execute vs_setup.exe when I relise what I have done I quikcly click cancel (when it says 'Prerparing to install') then I execute setup.exe, it still says I don't have the necessary windows components (IIS etc), so I click the link to double check I got everything that is needed and it gives me that error message, so I try vs_setup.exe and it tells me I need to run setup.exe

Argh!