Just received new HP computer with Vista Home Premium 64. My printer is a HP Photosmart 7550, when installing on new vista computer I had to install an alternative driver for HP Deskjet 5550 as HP does not have a driver for the 7550 with Vista 64. Printer set up fine and is working on new computer. Added printer to home network on Vista and had no problem. Tried to print on two 32 bit systems running Windows XP SP3. Both computers recognize network but when I try to add printer they indicate that vista computer does not have proper driver. What are my next steps. Thanks for any suggestions. Russ