life_maker

yes i m sure its switch and i removed it, and i tried to remove all connections and i kept 1 and it works good then i added another 1 and it works fine ,but still cant see each other when i tried to access the network i got this msg "the specified server cannot perform the requested operation"

Hallo I have problem in my ADSL router (D-LINK),,, 1 of my friends install switch on my network after that every thing GONE,i have 4 PCs and known of them can c other,,,internet is working fine but VERY SLOW i tried to RESERT router but nothing happened what shall i do ???