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Re: officejet 6500a plus on windows home 7 premium ad hoc lost connection
With ad-hoc connections, it is really intended more for printing in a pinch without having the hassle of setting it up on a network. Or, say you have two computers and you have it connected through USB to one and a laptop that is wireless, you could print through ad-hoc from the laptop.
Honestly, I would recommend picking up an affordable standalone wireless router (Netgear, Linksys, etc.) and connect the printer to it (wireless or Ethernet, does not matter). From there, connect the computers to that network and you should be able to install and print without any issue. You may find the router might prove useful beyond just this setup or may be good to have if you plan on doing events like this on a regular basis.
The printer itself is not a router and communicting with multiple devices simultaneously can create a congestion in the connection causing problems similar to what you are experiencing when using ad-hoc for that many devices.
Most USB 3G devices allow an Internet connection regardless of the network connection of the computer. You may need to contact the USB 3G provider to find out why it isn't as most will connect regardless of the network connection of the computer. I would be very surprised if it really is one or the other.
I have been trying to think of a way to share the printer without the wireless router to get the 3G connection, but I can't find a way to allow all devices to print simultaneously without the router.
You mentioned the printer is connected through a UTP cable to the router. The Officejet 6500A does have a wireless setup wizard to connect to a wireless network if that is what you prefer (most routers have a wifi network by default). To use this, you can go to Setup>Network>Wireless>Wireless Setup Wizard. The first step after that asks for a WPS option. Skip the WPS and then it will ask you for the network password. The default network password, if it has not been changed, should be in the router's manual.
