Desperate - cannot connect or access wireless network with WIN 7

In desperation, all boffins, geeks and wizards at Microsoft – I need help. I have had a home network now for at least 10 years and for the first time, I just cannot get it to work. That is since I upgraded to supa dupa Win 7 Prof. I have three machines in the network, two laptops and one desktop. Printers, backup drives etc all attached to the desktop. Desktop and one laptop running Win 7 Prof. One laptop running Xp.
In a nutshell, I have tried everything on this website and others and nothing works. I am no idiot around this stuff and I am simply dumb founded. I have set up and recreated Homegroup, changed settings, disabled my Eset firewall as well as win firewall. You name it I have tried it – to no avail. After doing some research it appears many, many people have a similar problems. Machine can see each other, but come hell or high water, cannot access. I am soooo disappointed with this. Please tell me there is something different that I can try. At this point, all my hardware is locked out since upgrading to Win 7.

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Networking home computers running different versions of Windows

XP Computers in the Windows 7 Network Map

You mention disabling two firewalls. Using two firewalls other than your router firewall can cause conflicts so it's best to only use one.

http://windows.microsoft.com/en-us/w...sked-questions

I've tried exploring, setting up network printer, through "Network", Homegroup - you name it, I've lost track of what I tried. Error as in picture.