Windows 7: Sharing files between 2 Windows 7 in a Windows Domain

I have a Windows 2008 Server and Domain. I have 2 laptops in the Domain with Windows 7 Entreprise, both Wireless. I shared the drive that needs to be share.

From one Windows 7, I cannot access the other Windows 7, I do not see the PC, and the share and cannot map it.
From the Windows Server, I can access both PCs and the Folders without needing to logon since I am using the same userID.

From Windows 7, I can connect to the Server.

RD

Is File and Printer sharing turned on for both?

Yes it is. See attached file.
Thansks,
RD

Well, it is working now!

I reset the Wireless router and it fixed (!) the problem.

I still do not understand what was casing the problem though.
To summarize:

I had 1 Windows Server 2008 wirh AD.
1 Laptop #1 with Windows 7 (Wireless) for 4 months (Upgraded from Vista)
1 Laptop #2 with Vista Business (Wireless)
1 Laptop with XP SP3 (Wireless)
1 Desktop with Vista Ultimate (Wireless)

All PCs are in the domain, using a single userID with Administrators Rights.

Since I upgraded the Laptop #1 to Windows 7, I found that once in a while, my Vista laptop would not connect to the wireless after rebooting and I needed to reset the wireless router. XP and Windows 7 where not having any problems, just the Vista (Both Laptop #2 and the Desktop)
After resetting the wireless,I was not having any problems sharing files between Windows 7, XP and Vista.

Yesterday, I updated Laptop #2 to Windows 7. After that, I could not connect to the Windows 7's Laptops, Vista, and XP, but could from the Server.
I reset the Wireless router and it is all working.

Anyone had simular experience with Wireless and Windows 7.

My wireless Firewall Router is a Fortinet WIFI60B.

Thanks for stopping by and for your input if any.
RD