Home wireless network connections cut - a router issue?

I have 2 PC:

1 desktop running XP (SP3) on a H61DE/S3 Asrock mobo and Intel G620 2.6ghz CPU. RAM = 2 x 2 GB.
2. laptop running Windows 7 + Intel i3 CPU
3 wireless router D-Link DSL-2680 =
The office is directly connected to the router via an ethernet cable wireless.
I created a wireless network which consists of my office and cell phones with the help of a USB and the XP Wizard on my desk. I then clicked on "Network Setup Wizard" in the Control Panel on my desktop (XP) and created the network connections.
When I boot-up the two machines, I can see and access the connections network of desktop and laptop.
HOWEVER, if I let the machines for a while and then come back, although I can see the icon for "DESKTOP" in my network places on my laptop, when I click the icon, the cursor looks like this market, but then an error window appears stating that it cannot find the device and I want to diagnose the connection. When I click YES, sometimes, it detects the OFFICE and sometimes it doesn't.
The same thing happens on the desktop when I click on the "PORTABLE computer" icon in "My Network places".
The strange thing is, when I try to connect via Start Menu / run / \\'IP address on the laptop or desktop, I can connect usually either to the PC.
The questions are
1 can you explain why I should b affected by these connection question - is this a problem of compatibility between window7 and XP?
2. what type of home network, maintained by the router or directly between the laptop and desktop computer without involving the router?
Thank you
I assume that the HOMEDESKTOP, in this case, XP is the master browser because it is physically connected to the router and it is this machine that I created the wireless network and local.

N ° master of domain is chosen in an election.  All devices have an equal chance of being elected little matter how they are connected. (A domain controller can always win, but that's neither here nor there).  The problem here is that the Win 7 machine doesn't listen to the broadcasts and therefore think that it is the only device on the network and therefore chooses himself as master of go.  The XP machine is involved in a normal election except that the Win 7 machine does not participate because he is not listening.  They both choose and for a while, you have two masters to browse.  The only listening to computer (XP) finally gets tired of hearing machine Win7 and abandoned as a master browser.  Win 7 becomes the only browser then, but it does not work because he doesn't listen to any computer on the network.  You can check this by bringing a window prompt (start-> Run-> "cmd") and enter the command:
nbtstat - a HOMEDESKTOP
or
nbtstat - a ROMANLAP1-PC
If the targen computer thinks that he is a master of travel, you will see a line "__MSBROWSE__".

For some reason, keeping the folders "My Documents" opened on both machines maintained the connection for 15 hours that day.

Anyway that you can keep the active connection, the machines will partner with the other.  Once a connection is idling, then it must re-establish contact and is when the master browser or a response of diffusion is necessary and the Win 7 machine is unresponsive.

Try following all the steps in the article according to which apply to your configuration:

"Networking of computers running different Versions of Windows"
  <>http://Windows.Microsoft.com/en-us/Windows7/networking-home-computers-running-different-versions-of-Windows >

I don't think there is a firewall in itself, but the way Windows 7 manages 'Home' vs networks 'Public' that can do behave like a firewall and cause problems with firewall-like. Article states that ' the network location is a setting that allows Windows to automatically adjust security and other settings according to the type of network to which the computer is connected. "  --they don't talk a firewall, but this is part of what makes a firewall...

HTH,
JW

Tags: Windows

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    Windows can be disable your network adapter to save power. You can try to disable the power saving option in the network adapter properties

    I suggest you try the steps to disable power saving option. Check if it helps.

    a. open network connections by clicking the Start button, and then clicking Control Panel.

    (b) in the Search box, type adapterand then, under network and sharing Center, click on view network connections.

    c. right-click on the connection and then click Properties. If you are prompted for an administrator password or a confirmation, type the password or provide confirmation.

    d. click the Networking taband then click on configures.

    e. click on the power management , clear the checkbox allow the computer to turn off this device to save power tab and then click on OK.

    See the article for more information.

    Wireless and wired network problems

    http://Windows.Microsoft.com/en-us/Windows/help/wired-and-wireless-network-connection-problems-in-Windows

    Hope this information helps. Answer the post with an up-to-date issue report to help you further.

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