OK, I know everyone's dealt with one of these along the line, and I thought I had these dang printers figured out completely, but this one is a flat out freak, and anyone who can help, I appreciate it. Working in an environment with several new Dell
Desktops (Precision T3500s) with Win7 x64 installed on them. They have an old HP LaserJet 5si on the network. Several of the Win7 computers on the network are already connected to it by the private IP, and they work. I just installed
a new client, and trying to install to the printer by IP, can't find the driver. Look on HP's site for Win7 x64, and they say "it's already installed on Win7, we're not giving you a driver". Well, it's not installed on Win7 x64, not when I try
to navigate to it when installing the printer, there is no "LaserJet 5si" listed. Weird thing is, when I look at the other computers, and RE-Install that same printer, I CAN find the "LaserJet 5si" printer listed. OK, so I must not have all
the updates on my new computer, right? YES I DO, WINDOWS UPDATE TELLS ME IT'S ALL UP TO DATE. WTF??? Thanks in advance.

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OK, I figured it out FINALLY. The problem was with the "Windows Update" feature within the "Install Printer" wizard. A folder called "Software Distribution" on the root of C: was causing the trouble. Found this fix, the Windows Update feature
then worked, then the correct driver installed. Dang there's 6 hours of work...hope this helps someone avoid the trouble.
These steps did resolve the issue:
1. Open Task Manager (Ctrl-Alt-Del)
2. Click Sevices Tab and then Services Button (Bottom Right)
3. Under Name find "Windows Update"
4. Right click "Windows Update" and select Stop. do not close
5. Open Window Exploper and browse to C:\Windows
6. Delete the Folder "SoftwareDistribution"
7. Go back to Servies, Right click "Windows Update" and select Start
After this, do your usual routine to install the printer, and select "Windows Update" to find driver (it shouldn't fail now), and afterwards, you should be able to find the correct (in this case LaserJet 5si) driver. Yay!

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