First you should download and run the AVG uninstaller to insure that AVG is completely gone from your system.
http://www.avg.com/gb-en/download-tools
Do the same for bitdefender.
http://www.bitdefender.com/KB333-en--How-to-uninstall-BitDefender.html
After that, go through this Homegroup check list. I posted these in order from most likely problem to the least. Because you have all Win 7 machines you should try using Homegroups for your network.
Ultimate Troubleshooting Guide for Windows 7 HomeGroup Connection Issues
There are several reasons why you can’t access your HomeGroup. Here are the most popular reasons for not being able to connect to your HomeGroup.
If none of these troubleshooting tips work, try restarting your computer, or
leave and then
re-join the HomeGroup.
To make sure that the required services for Homegroups are running perform the following steps.
Go to C:\Windows\ServiceProfiles\LocalService\AppData\Roaming\PeerNetworking and delete all of the files in this folder. Now restart the computer.
Go to Services again and you should be able to start 'Peer Networking Grouping' and 'Peer Name Resolution Protocol'. Restart the computer again.
When you log on this time, check the event log again, to ensure no errors concerning the two services are present and also check Services to ensure the two services concerned are running.
You should now have full functionality restored to your homegroup.
There are a few more things you can do if it's still not working.
I found a reference in the MS knowledge base.
You have to set the disabled items registry key to 0
But..... if it hasn't got one ( mine didn't) you have to create one first and
then set it to zero!!!!!!
Or in Microsoft speak - if nothing is disabled everything is disabled unless you tell it that nothing is disabled.
In technical terms;
regedit
hkey-local machine\system\currentcontrolset\services\tcpip6\parameters
Then you have to set the DisabledComponents Dword to 0
And if there isn't a disabled components dword you have to create one and then set it to zero.
Hey everyone! I was having the same problem but I found a solution. Apparently, not sure why, but Windows did not change the settings in the registry after enabling IPv6. I found a solution over
here.
For anyone else having this problem:
1. Click Start. Search for run and press enter. In the field, type
regedit and press OK.
2. In the registry, navigate to the following key.
[HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters]
HKEY_LOCAL_MACHINE
\SYSTEM
\CurrentControlSet
\Services
\Tcpip6
\Parameters
3. In the right pane, right-click on “
DisabledComponents” and select modify. In the value data field, type
“0″ (without quotations) and press OK. If the value was set to ``FF``, it was turned off.
4. Reboot your computer and it should work. It did for me.
These settings also need to be enabled in services for Homegroup networking to function properly.
Turn on
DNS Client, Function Discovery Resource Publication, SSDP Discovery, and UPnP Device Host services.
For wireless on Windows 7, you need to run the network setup wizard for everything to work correctly.
