Windows 7: 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.

In what ways are you accessing one machine to the other, and what errors did you get?

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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.