You should have added to that thread instead of starting a new one as it contains the important information eg printer model, os, etc
Uninstall the HP software on the wife's pc and start again. It is absolutely vital that you work in the right order. It is usual to install the software first and then when prompted to switch on the printer and then connect. Instead of using the cd provided you could try going to the HP site and downloading the latest versions. Try a different USB port too.
In the meantime you seem to have 2 printers. Are your PC's networked? If so you could share the printer.