HP LJ P2014 Printer keeps coming up as unknown device

ni68ana used Ask the Experts™
Hi, I have an HP Laserjet P2014 which I am trying to move to a new computer in the office. It worked fine on the previous computer to which it was attached.
During the first attempt at installing the printer on the new computer, I mistakenly cancelled the process in the middle. Since then the printer comes up as "unknown device" whenever I reconnect it and try to install. I get a balloon popping up saying "USB device not recognized".
I have tried rebooting the PC, restarting the printer, and changing the USB port to which the printer is connected. I've gone into device manager and uninstalled the "unknown device" which appears under USB Root Hub. If I try to to open the unknown device and update its driver with the one I have downloaded from the HP site, I get the error "The specified location does not contain information about your hardware".
How can I clear Window's "opinion" of this printer so it can be installed properly?
Thanks in advance.
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One possibility is that there is a hidden device that is conflicting with the printer installation. Follow the instructions here - http://support.microsoft.com/kb/315539, disconnect any USB devices and uninstall any "greyed-out" devices, then reboot the client PC, and try the printer installation again.
Otherwise - remove all printer drivers as per here - http://www.members.shaw.ca/bsanders/CleanPrinterDrivers.htm, and try the installation after that.
Also - check your driver - should be this one: http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareDescription.jsp?lang=en&cc=uk&prodTypeId=18972&prodSeriesId=3322555&prodNameId=3322573&swEnvOID=228&swLang=8&mode=2&taskId=135&swItem=lj-52546-3
In the end it turned out to be the USB extension cable I had been using... the printer needed to be somewhat far from the workstation. when I replaced the extension cable with a single long cable, the printer was recognized fine.
Your suggestions were excellent though, I appreciated the clean print drivers guide and the hidden devices tip, both of which taught me things I didn't know before. Thanks very much.

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