Officejet 8620 two problems a)Win7 firewall wifi connection and b)multihoming the printer

Question

Bought the printer this afternoon and set up one computer - printer connection with wifi as advised in the enclosed paper work and CD. No problems.
When setting up the second computer (also with wifi) using the enclosed CD I got an error message that the hp software can see the printer at the IP address I gave it but it couldn't auto connect using the "typical connection method". Advice in the dialog box was to change the computer firewall settings for "typical connection" method. No advice  on what that might be. Looking at the Win7 firewall, all HP printer software is checked off for both the home network and public. What else does the Win7 firewall need to enable to make automatic printer connection work???  BTW I took the installation software's advice and punted for now. The warning by the software was that if the printers IP address changes I will have to manually change it in the computer withthe firewall problem (ugh).
Which leads to the second problem:
A couple of my computers are ethernet only. No wifi. When I plug ethernet in to the 8620, it sets an IP address for itself on the ethernet, but it  abandons the wifi IP address. How can I print from some ethernet connected computers and some wifi connected ones.
Any constructive advice is VERY WELCOME.
I apologize in advance if there is already a solution posted for either of these problems; I could not find them searching the forum.
Lenny W.
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Answer 1

Welcome to the HP Forums lennyw07016,
I see by your post that you are having issues installing the printer on a second computer. You would also like to setup the printer on the computers that are hardwired to the router. I can help you with this issue.
You can only use the Ethernet or Wireless at a time. The Ethernet connection turns off the Wifi.
You can have the printer setup on the wireless network and still add the printer to the computers with the hardwired connection to the router. As long as they are on the same network.
I have provided a document for different ways for setting up the printer on the wireless network.
Installing the Printer Software on a Wireless or Wired (Ethernet) Network Connection.
You should have the option to type in the printer's IP address.
Printing a Network Configuration Page.
Here is another method for converting USB to wireless.
Installing the Printer Software for a Wireless Network Connection.
Go to step 4 under the operating system selected.
If you are still having issues, check the IP address on the computer.
Go to start, type run in the search box, type in cmd, then type ipconfig.
Check the IP address.
Now check the IP address for the printer.
Do the first 3 sets of numbers match?
Try and ping the printer.
In the same window, type ping printers IP address (space between ping and IP address)
What are the results?
If you need further assistance, let me know.
Have a nice day!
Thank You.
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Gemini02
I work on behalf of HP