The network path was not found

"\\PC\ResourceX is not accessible. you may not have permission to use this network resource. Contact the administrator of this server to find out if you have access permission."

Check your network settings
In the connection properties ensure that 
Client for Microsoft Networks
has been checked 
 ------------------------
1- Open Network Connection
2- Check box File & Printer sharing > ok
3- Disabled NIC
4- Enabled it back
5- Open CMD > ipconfig /flushdns
------- -------------
Are they all configured for remote access?, are they all Windows clients?
You should also check that your DNS and DHCP servers are configured properly.
How are you accessing them? \\hostname\c$?
 -------------------

Fixing the winsock and tcp/ip worked for me. On the run command I used the following commands —-
for winsock run:
netsh winsock reset

to reset tcp/ip run:
netsh int ip reset c:\resetlog.txt

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IS THE FUCKING SERVICE: "TCP/IP NetBIOS HELPER".. PUT THAT FUCKING SERVICE STARTED!! AND AUTOMATIC!!..

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I think starting/stopping Routing and Remote Access resets something. From your description it sounds like some other competing service is starting up again.
Do you have other computers on your network that could be competing for position of Master Browser? In the past I have had this problem. One thing I would say is to look in your Event Log, like it describes here: http://support.microsoft.com/kb/135404

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Source

All PCs were running Windows Vista.
Ignore most of what you've read online -- stuff like disable your firewall etc... I saw those same tips and they were just not going to help.
I found that this is what fixes it:
1. Go to control panel
2. Click on "Network and Internet/View network status and tasks"
3. Select the "Manage network connections" link on the left "Tasks" section
4. Double-click on your LAN adapter that you're using to connect to the network. (For example, "Local Area Connection"
5. Select properties
6. Select "Client For Microsoft Networks"
7. Click on Properties
8. On the RPC Services tab, go to the "Name service provider" and select "Windows Locator" from the drop down menu
9. Click OK
10.Click close
11. Click close
After a second or two, you should be able to now connect to your other computer.
I have no idea which software changed that setting and I found that when I went back to it, it had been changed again to blank.
So if you see the problem again, follow the steps above.
It worked for me and I hope it works for you too!
If it does, drop me a note at o-e-c-h-e-r-u-o at gmail.com

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A solution (there could be several causes) * On the target machine (the one you’re trying to connect to) open up Services, under Administrative Tools in the Start Menu. * Scroll down to the Computer Browser service. * If it is Disabled or set to Manual, set it to Automatic. * Then start it. It may stop immediately again, but this is OK. * At this point try to connect to the target machine. If it still doesn’t work, you can try the following: * open up Network Connections, under Control Panel. * Right click on your network adapter and click on Properties. * Click on Internet Protocol (TCP/IP), then click on Properties. * Click on Advanced, and click on the WINS tab. * Even if it is set to Default, set the radio button to Enable NetBIOS over TCP/IP. * Press OK on each screen until everything’s closed. * Go back to the client machine and try again. * You should be able to connect! If it still doesn’t work: * Go back to the Services window and find the service named Routing and Remote Access. * Double-click on it, set it to Manual, and stop it. * Close Services and try to connect from your client machine again.

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http://www.anetforums.com/posts.aspx?ThreadIndex=42837

http://compnetworking.about.com/gi/dynamic/offsite.htm?zi=1/XJ&sdn=compnetworking&zu=http%3A%2F%2Fsupport.microsoft.com%2Fkb%2F811259

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"The network path was not found" error on Win XP sp2

The problem
You are unable to connect to any network resource (network shares, printer, etc) on a Windows XP machine, from a Win XP client.
 

A solution (there could be several causes)

• On the target machine (the one you're trying to connect to) open up Services, under Administrative Tools in the Start Menu.
• Scroll down to the Computer Browser service.
• If it is Disabled or set to Manual, set it to Automatic.
• Then start it. It may stop immediately again, but this is OK.
• At this point try to connect to the target machine.

If it still doesn't work, you can try the following:

• open up Network Connections, under Control Panel.
• Right click on your network adapter and click on Properties.
• Click on Internet Protocol (TCP/IP), then click on Properties.
• Click on Advanced, and click on the WINS tab.
• Even if it is set to Default, set the radio button to Enable NetBIOS over TCP/IP.
• Press OK on each screen until everything's closed.
• Go back to the client machine and try again.
• You should be able to connect!

If it still doesn't work:

• Go back to the Services window and find the service named Routing and Remote Access.
• Double-click on it, set it to Manual, and stop it.
• Close Services and try to connect from your client machine again.

For further info on this issue, you may like to consult the following recommended books: Home Networking For Dummies (For Dummies (Computer/Tech)), Microsoft Windows XP Networking Inside Out, or Windows XP Home Networking.

If this helped you, or if you found another solution to this common and frustrating problem, please leave a comment to help others!

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Fixing the winsock and tcp/ip worked for me. On the run command I used the following commands —-
for winsock run:
netsh winsock reset

To reset tcp/ip run:
netsh int ip reset c:\resetlog.txt

Make sure only the computer with the router is set to be the server also.
go to network places
view network connections
right click on the various connections go to advanced tab and make sure the computers without the router don’t have
“allow other network users to connect throught this computer’s internet connection” checked

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Solution?

Download windows resource kit from the following link.
4shared.com - online file sharing and storage - download Windows Resource Kit.zip
Then enter the following commands. (Attention: they are case sensitive.):
net user guest /active:yes
ntrights +r SeNetworkLogonRight -u Guest
ntrights -r SeDenyNetworkLogonRight -u Guest

The first command enables network access for Guest, the two subsequent ones change two different policies to allow network access for Guest.