Good day Robert
I have tried everything on there, except for the disbling the IPx6, I didn't try that, because I haven't done that before, when i had win 7 x32, I didn't have to do that and I could see the other XP computers. (Plus it sounds really technical.. )
But I heard from someone that: win 7 x64 can't connect to network IF it uses a wireless system.. And I'm using a wireless system.. So could that be the case?
Are all the computers connected to your network using "Wireless"?
Win 7 is using the wireless, but the other two XP computers are using cable
For my own computers in my home (unsecured) network, I find it makes networking easier if I have the same user accounts on each computer. I have an "Admin" user on each computer plus one for my use and one for the wife.
When I go to the "Network" link and select a computer in my local workgroup, I receive a request for a user name and password. I use the Admin user name and password and after that, I do not see the password request again. This just makes networking easier.
Here is a less technical way of disabling IPv6 in Windows 7:
Open your "Network and Sharing Center" by right clicking the network icon, lower right, in the task bar.
Click to open the local network (in your case the Wireless Connection, in mine it is the Local Area Connection), and select "Properties".
Untic, or remove the check mark in the box next to the IPv6 line to stop using it. You may need to reboot to complete the change. Return to the previous screen and notice that IPv6 is not being used.
BTW, I had to give up my wireless Windows 7 laptop and replace it with XP. However, it still connects seamlessly in my home network with all shared folders accessible to all computers.
One other suggestion for you is to go to all of your computers and change the workgroup name to something different. This will refresh the workgroup settings and may help with access permissions and such and get you going.
Cheers!
Robert