Since 23/07/2013 I see that 2 other pc on my network

HI, please help. I have two separate networks at two different places in the same question.

01:13 - case pc, 8 are running Win7 Pro, 8 are held in Win XP pro, a Win7 machine acts as a file server and all have access and everything has been fine for about 1 year now. From last Tuesday, only 1 of the Win7 pc can see 2 other pc, it always has internet and I can ping other machines, but I don't see them and cannot reconnect my mapped drives. I tried the system restore, I looked at all the parameters of intellectual property and are all as they have been. disabled the firewall, still no joy.
Incidents involved 2.7 the win7 pc, XP and win 8, everything was visible at all, now only 2 machines Win8 and machine one win7 can see each other, the rest can see everything.

Hi Kelly,

Thank you for visiting the Community Forums of Microsoft.

Your question seems to be more complex than what is generally answered in the Microsoft Community Forums. It is best suited for it professionals about TechNet Forums that are well equipped with the knowledge on the issues of domain and workgroup. Please post your question in the TechNet Windows 7 IT Pro Networking Forums. To do this, please click this link:

http://social.technet.Microsoft.com/forums/Windows/en-us/home?category=w7itpro#Forum=w7itpronetworking&filter=AllTypes&sort=lastpostdesc&content=search

 

Hope this information helps you.

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