I have a LAN with 2 laptops and one desktop connected. The desktop has an HP Photosmart D7160 connected via a USB port. Both laptops have had Windows 7 installed for several months. The desktop was recently upgraded from Vista to Windows 7. After the upgrade, one of the laptops will still print, but the other laptop will not. The correct printer driver has been installed on both laptops. Reinstalling the printer driver on the desktop did not help. When the desktop had Vista installed, all printing functions were fine. I suspect a network problem, but don't know how to attack it. All computers are running Kaspersky Internet Security. I have tried disabling Kaspersky on the problem laptop, but no help. Any suggestions would be greatly appreciated!