Hi, My printer is a HP 4000 Laserjet which worked with my earlier versions of Windows on older computers (last version was XP). I was surprised when I bought this pc to see that the parallel port with pins was replaced by a usb port so I bought a usb adapter for my new pc. Well, nothing will print. After uninstalling and reinstalling, updating the printer drivers through windows, and much time searching, I found the hp section to download printer drivers for the 4000 series only to get a message saying that windows has blocked the download because the publisher is unknown, even though the download is coming directly from the hp website (HP Instant Support - Driver Check). Though I am the system administrator, and a bar pops up asking if I would like to download the software, I click "yes" then get the windows message that the download is blocked by windows (red shield with X). I hope someone here can help me resolve this latest problem. Thank you.