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It sounds like your internet connection firewall us on.
To see other computers you must turn it off.
To enable or disable Internet Connection Firewall
Open Network Connections
Click the Dial-up, LAN or High-Speed Internet connection
that you want to protect, and then, under Network Tasks,
click Change settings of this connection.
On the Advanced tab, under Internet Connection Firewall,
select one of the following:
To enable Internet Connection Firewall (ICF), select the
Protect my computer and network by limiting or preventing
access to this computer from the Internet check box.
To disable Internet Connection Firewall, clear the
Protect my computer and network by limiting or preventing
access to this computer from the Internet check box.
Rb
To see other computers you must turn it off.
To enable or disable Internet Connection Firewall
Open Network Connections
Click the Dial-up, LAN or High-Speed Internet connection
that you want to protect, and then, under Network Tasks,
click Change settings of this connection.
On the Advanced tab, under Internet Connection Firewall,
select one of the following:
To enable Internet Connection Firewall (ICF), select the
Protect my computer and network by limiting or preventing
access to this computer from the Internet check box.
To disable Internet Connection Firewall, clear the
Protect my computer and network by limiting or preventing
access to this computer from the Internet check box.
Rb