Resolved Lost network & 651 error

Yesterday had a network that was setup which included 1 Win 7 laptop and a WinXP laptop on wifi, and a WinXP ethernet connected computer and a Win7 ethernet connected computer (this is my main).
Today have no access from the main Win7 computer to any of the 3 others. The 3 can see it, though.
The only one the main "sees" is the Win7 laptop (wifi). But it can't access it even though from the laptop end, it is set for access from anyone on the workgroup network.

Also, the connection on the ethernet connected main Win7 computer was not the way it was connected yesterday. Instead it was connected via a wifi dongle I keep on it for safety.
When I tried to add back the ethernet connection (Realtek card) I received a 651 error message. I was doing it through the Control panel network area. Started researching the problem.
Changed the rasppoe driver (after the trusted installer issue) and it didn't make any difference which one used (orig or new). Rebooted the modem/router, and disabled the wifi connection. The computer connected up with the ethernet connection just fine.
However, I still can't access the network of the other 3 (workgroup) via the ethernet or the wifi network connection.
Unless I manually disable the wifi connection the computer utilizes the wifi instead of the ethernet connection. That's a weak connection compared to the ethernet.
Ok, I think, but how can I reset the workgroup network for this computer? It would seem I would go back to how I originally did it but for some reason the network/share in control panel networking are not doing the job or I have forgotten something.
I have checked the properties of almost everything to see if something seemed odd. It all looked normal but the IPv6 said no internet access and I couldn't remember if this was the way it was before when everything worked. If that's part of the problem, how do I change it?

FYI: I can't setup a home group between the two win7 computers but never could. Device manager shows all working. No new programs or changes were made yesterday to the main win7 computer but an update of the Oracle Virtual Box was put on the other win7 machine in the network but that seems a longshot for explaining this.

Having had it all working fine for months and suddenly over night it changes, has left me wondering where to begin setting it back up from the main win7 desktop (ethernet). Any direction help would be appreciated.

 

I solved the problem by going through all the settings first and seeing that nothing was wrong with them and that the 651 error message had stopped, I discovered that when utilizing Oracles VM Box, the newest addition (an improvement for sure), now includes a network setup and drivers for an additional network for the Virtual box. This must be deactivated until you need it or it will conflict with the network setup you may already have. This discovery might help others who want to try and/or use the Virtual machine.

 

Solved

Forget all that Rasspoe nonsense…
i had the same trouble after a windows update..
i set internet options for ipv4 and ipv6 to manual and entered the ip and dns addresses manually, and it didnt make any difference.
So here`s what to do.. and it takes a few minutes, and no experience required.

first turn power off and unplug all leads.
then remove the casing so you can see he motherboard.
remove the battery (looks like a watch battery)
then plug in monitor "“ keyboard and power lead and boot up.
you will get an error message stating that the pc cannot boot up, this is because the battery has been removed.

what you have actually now done is reset the bios.

turn off the pc and remove all leads again, and insert the battery again.
reboot pc after plugging all leads back into the pc.

go to the internet icon in the bottom right hand side of the screen and open network and sharing folder. click on the area (on the map of your pc to internet) and it will run a diagnostic check for you, and repair the fault.

 

Interesting answer

I get it. An interesting way to reset. I will keep it for reference. Wouldn't the same idea of a BIOS reset be possible by simply entering the BIOS and achieving the same reset? Curious.
My problem turned out to be the VM program I set up. It automatically created another network setup that became the default network setup and preempted my working network.
I left that tidbit of advice for anyone setting up a new VM.
Thanks again for the input.

 

Got it. Thanks.