ok da malo pomognem, gpedit.msc, computer configuration, windows settings, security settings, local policies, user rights assignment.
pogledaj pod access this computer from the network, deny access to this computer from the network
moglo bi recimo biti nes od tog dvoje problem. ali kao sto sam kazes ima toga puno u policy editoru ali dao sam ti link gdje je sve objasnjeno pa istrazi malo (trazi network ili sharing)