Hi Nigelhol,
Welcome the HP Support forums. I understand that you are getting an error during the installation of your Officejet 4500 series printer.
I have included two links with detailed trouble shooting steps to take when you get an installation error. The first one is a trouble shooting document from HP. The second link is to a post by PCWizard on the forums.
A ' Fatal Error' (MSI error) Displays on the Computer During HP Software Installation in Windows
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c02266980#N102
HP Support Forums - post by PCWizard