You might not have permission to use this network resource. Contact your administrator.__Windows 7, Vista, and XP networking

I've just about read every single post and blog there is on the internet about networking Microsoft's OSes.
I have a Windows 7 Desktop, a Vista Laptop, and an XP Laptop. None of them like each other.
They can all see each other, but the XP gets the You might not have permission error message. 7 (when accessing XP) gets "Windows cannot access \\(name). There might be a problem with your network." message.
I can usually access the XP desktop from my vista laptop, but I can't access vista or 7 with XP.
Yes, they are in the same workgroup.
Yes, they all have the file sharing on.
Yes, advanced file sharing is on for vista and 7.
No, the firewall is not blocking it.
I first tried to share C:, but then read that apparently you can't share it, so I tried sharing a random folder, and gave full control to everyone in permissions (this is all on 7 btw). XP still can't access the 7. Neither can the Vista.

Thank you.

Well thank you all but I found the solution.

simply windows 7 chooses by default to make the encryption 128 bit and this is not OK with other windows versions. This makes problems when you try to access the shared folders on the pc with windows 7 from another computer with a previous version of windows.

so in the control panel >> network and sharing center >> Advanced sharing settings >> File sharing connections

choose the option:

Enable file sharing for devices that use 40- or 56 bit encryption.

I hope your problem is solved.


Khaled Al-Nagar

Arabian and Egyptian

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Maybe this can Help.


The following looks like a long story (it is only 600 words). I do not know what the user's overall knowledge is, and what exactly was already done. Thus the info goes through the motions of configuring and checking most of the common aspects of Windows OS' LAN features.

All aspects should be checked, stating that it "worked before" , or perseverating on"I did Not do any thing ", is not a way to deal withcurrent Sharing problems.


Win7 when configured on peer-to-peer Network has three types of Sharing configurations.

HomeGroup Network = Works only between Win 7 computers. This type of configuration makes it very easy to Entry Level Users to start Network sharing.

 Work Network = Basically similar to the previous methods of sharing that let you control what, how, and to whom folders would be shared with.

 Public Sharing
= Public Network (like Internet cafe) to reduce security risks.

 For best results log to each computer's System Screen and set all the computers to be on a Network with the same name while each computer has its own unique name.

Make sure that the Software Firewall on each computer allows free local traffic. If you use 3rd party Firewall On, Vista/XP Native Firewall should be Off, and the active Firewall has to adjusted to your Network IP numbers on what is some time called the Trusted Zone (consult your 3rd Party Firewall instructions

General example,

Please Note that some 3rd party Software Firewalls keep blocking aspects of Local Traffic even it they are turned Off (disabled). If possible configure the Firewall correctly, or totally uninstall it to allow clean flow of local network traffic. If the 3rd party software is uninstalled or disables, make sure that Windows native Firewall is On .


If your network is comprised of Win 7 only and you want a simple Network, use this.


After configuring the Homegroup scroll down to the Permission/Security section.


Networking Win 7 with other version of Windows as  Work Network.

In the Network Center, clicking on the Network type opens the window to the right.

Choose your type of Network. Notice the check mark at the bottom, and check/uncheck it according to your needs.

Win 7 -

Win 7  Work Network specific folder sharing -

Vista File and Printer Sharing-

Windows XP File Sharing -;en-us;304040

Printer Sharing XP -

Windows Native Firewall setting for Sharing XP -

Windows XP patch for Sharing with Vista (Not need for XP-SP3) -

When finished with the setting of the system it is advisable to Reboot all the hardware including the Router and all computers involved.


If you have Permission and Security issues, check the following settings.

Point to the a Folder that meant to  to be share. Right click and choose properties.

In the properties

Click on the Security tab shown in the pic bellow to the right) and check that the users and their permission (shown in the pic bellow center and left) are correctly configured. Then do the same to the Permission tab.

This screen shot is from Win 7, Vista's menus are similar.

In both the Security panel, and the Permission panel you have to highlight each User/Group and examine that the Permission Controls are checked correctly.

When everything is OK, Reboot the Network (Router, and computer).

* Note . The Groups and Users shown in the screen-shoot are just an example. Your list will look the way your system is configured.

**Note . You have to establish specific users. Everyone means all of the users that already have an account and been established as users. It does not mean Everyone that feel that they would like to login.


***Note. Some of the processes described above are done Not for Windows sake but to compensate for different Routers and the way their firmware works and stores the info about the computers that are Networked.


Jack-MVP Windows Networking. WWW.EZLAN.NET
Jack MVP, Microsoft Windows Desktop Experience-Networking.

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Question Info

Last updated April 27, 2020 Views 292,665 Applies to: