Dell desktop and Acer laptop on LAN, both running Windows 7 HP x64. Network printer is HP all-in-one LaserJet M1522nf. This printer has its own network address and has worked perfectly in that configuration after previously being connected via usb cable directly to the Dell PC. Have made several attempts to enable printing from the laptop, both using network discovery (which has no problem finding the printer) and manual software installation, and the installation fails at the same point, whether initiated from the desktop download folder or a download from the HP site. This same hangup occurs with or without the network firewall active. The installer proceeds to send this info to HP and suggests the HP support page, but the virtual troubleshooter function has no answer. Of course, this printer is beyond the HP support term. Strangely enough, during one of the attempts, the laptop did at one point produce a requested print, even while citing this failure. But currently, there is no HP software in the list of installed programs and the printer does not appear in Start>Devices and Printers. Cue up the twilight zone! Anyone have a suggestion?