PLZ HELP do i have multipe connections???

i have been having some problems with my net connection. it drops out every now and again (like dial up does). cant access net but still on local network. but thats the second problem!

the mian thing that has me confussed is i suddenly have "multiple networks". few times when net drops out the network and sharing basic map shows 2 networks. local network and unidentified network.

i only have 1 computer on network (ie plugged into router) and it is using an ethernet connection...router NOT wireless only usb or ether.. net wont connect if the extra network connected.

where did the second network come from?why?should i be worried????