Photosmart C4780 install fails at "system cannot find specified file"

Question

My problem started simply with the printer, an HP Photosmart C4780 which has always had a wireless connection and would not print.  At first, the network connection checked out fine from the printer control panel.  I ran a Microsoft printer troubleshooter, which found a block in the print queue, and cleared it.  The first test page would not print, but the "inner test page" did print.  I didn't understand whatever that meant, so I looked for help from the HP site.
I ran the HP Print and Scan Doctor, and it suggested I reinstall the driver.  I downloaded and saved the current one from HP (PS_AIO_06_C4700_USW_Full_Win_enu_140_175.exe) and then uninstalled the existing driver.  When I attempted to install the new one, a window popped up saying, "The system cannot find the specified file," with only one box to click which said simply "OK".  The installation went through to "review installation options", after which came “checking updates, downloading updates, installing updates” and then it was while “checking system” that the “cannot find the file” window popped up, and when I clicked “OK”, the installation window as well as the error message box, just disappeared.  What I assume was the file path was in the frame of the window, but the whole thing didn't fit so it didn't show the end.  What I could read was “C:\Users\ … \Local\Temp\7zS588E\Setup\.\Setup\hpzpnp40 …
I found one topic on the same problem for the same model printer in the forum, which offered this fix:
You will need to first complete a level 3 uninstall of the software. I have included the steps below for this.
1. Press the Windows key, and the letter R
2. Type %temp%, and click OK
3. Open the 7z folder (most recent one if there are multiples)
4. Open the util folder
5. Open the ccc folder
6. Double click on the Uninstall_L3
Once the Uninstall_L3 has completed, please delete all items listed in the temp folder. Note, you will  not be able to to delete all items, please skip the ones that you cannot. Next please empty the trash, and perform a clean boot. I have included the document 'How to perform a clean boot in Windows'. If your computer does not request it, please restart your computer.
Once your computer is back up, you will need to reinstall the printers software. You can either do this by using the Installation CD, or downloading the software.
I did what was suggested, until it got to the point where it said it did not recommend removing any further items if I intended on using the HP Officejet printer (yes I have a second HP printer attached to the network) anytime in the future.  Not really understanding how this all works, I decided to stop what I was doing, so unfortunately it did not solve my problem.
Do I need to uninstall both HP printers before I can reinstall one?  And if I do that, is there any reason I would not be able to reinstall both printers?  Sounds like I'm asking for trouble.  Bottom line... I still cannot install the driver.
I have tried to install both the full and basic versions of the driver and always get the same result.
I have an HP Pavilion dv6-3100t notebook, running Windows 7 Home Premium, version 6.1.7601 service pack 1, 64 bit.  I haven't installed any new hardware or software.  This printer has always had a wireless connection.  The router I use is a Netgear 54 Mbps WGR614 v6 (supplied by my cable company), and the network includes not only my notebook and the Photosmart printer, but also an ASUS desktop, another HP printer, an Officejet 6300 series (used only for printing graphics and photos with a wired connection to the router), and a Vizio smart-TV.  I use Norton 360 Premier Edition and disabled the anti-virus auto-protect when I downloaded and attempted to install the driver.
Please help!  And thanks in advance for your time and attention.
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Answer 1

Hi wakey-wakey,
I would recommend accessing your Temp folders, rename a Temp folder to 7zS588E and run the installation from that folder. 
Please keep me posted.
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Jamieson
I work on behalf of HP
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