Can't access Windows 7 network nor homegroup via router or ad-hoc

I have a really annoying problem. I have 2 clean computers. They were formatted and Win 7 ultimate was installed on both computers. They have a PCI wireless card (D-Link DWA 525). Their hardware is identical, same motherboard, etc, beside the "server"
is pentium 4 and the "client" is celeron.
We have 2 routers and 1 modem. The first router, Airport Extreme, act as DHCP server, and provides the wireless network. The second router (TimeCapsule), connected thought ethernet to the first router, extends the wireless network (act as a bridge). I can connect
to the network and the internet works fine.
The problem is with the local network.
I can see both computers on the network tab. I can ping both by IP and by name. I made a Homgroup on the computer "Server". The computer "client" joined. I can see the libraries. Both computer's firewall are disabled. All firewalls from
the routers and the modem are disabled.
Double-clicking the library on the Homegroup does nothing. Trying to access the shared folder by \SERVER or by the network tab gives error "network path not found".
Basic settings, like file and sharing, etc, are on. Password sharing is off. Encryption is 40 - 50 (not the 128, I don't remember the specific number).This is both for Home and Work and Public networks.
Because I couldn't access the network, I decided to make an ad-hoc. Same problems. Even with static IP (192.168.0.1 [server] and 192.168.0.3 [client], 255.255.255.0 subnet) and NetBios forced at enabled.
I just can't make it work. I have tried a lot of info from here and other forums, but nothing has work. The worst is that another PC will join the network, but I haven't do it yet just because I can't make these PCs to work. As a test, I did put the other PC
in the network (Win 7 Home), and the same problem applied.
All the computers can see them in the Network tab, ping either ways with both IP and name, but when trying to access the pc over network, it gives network path not found error.
Yes I have shared files.
Troubleshooting both Homegroup and Network finds nothing wrong or just can't fix the problem.
Please help!

Hi,
I tried and received only errors (i don't remember know which ones).
However, I plugged the PCs via ethernet, let automatic IP address, and now I can access the network from both computers. Homegroups doesn't work because the network is public, but that isn't a matter right now, because I can access the files.
This makes me thing if the problem is the network adapter. In the Advanced tab on Device Manager Properties, I have the follow options, which I don't have idea what are they for:
AC_BE support APSD [disabled]
AC_BK support APSD [disabled]
AC_VI support APSD [disabled]
AC_VO support APSD [disabled]
APSD capable [disabled]
Multimedia/Gaming Environment [Enabled]
Roaming Sensitivity [Medium]
WMM Capable [Enabled]
Do you think some of that options are interfering?
Thank you

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