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HP 2605dn driver
I had trouble installing a Windows 7 64-bit driver for my HP 2605dn printer, and couldn't easily find a solution googling it. Here is what I finally did to get it working.
After selecting add a new printer, then selecting the 2605dn, I didn't see this model in the HP printer list. But if I clicked the Windows update button then it showed up and installed fine.
However, to get duplex printing to work I had to right click the printer and select Printer Properties, then Device settings and installable options, then select duplex unit installed.