Strange one chap (ette)'s
Vista home premium with an HP 8600 Plus printer via wifi or lan.
installs and prints fine, reboot the machine and there are no printers in control panel printers at all.
done some digging, spooler is running, done a uninstall with HP scrubber and reinstalled latest version (as admin) exactly the same.
other machines in the network work fine so its not the printer
read about a service called HP CUE Discovery which can cause these issues, but i dont have that services at all listed.