i found some documents on symantec site about solutions of this problem,but all were about symantec corporate 8.X,9.X . which have grc.dat file on clinets and servers.
but my version is 10 . i searched on my clients and no one have this file,only the servers have it . so it seems those solution won't work as i test on on client which i copy grc.dat file on it but it didn't care about what i did .

so edit registry of this client manually , but i am not sure it be a safe solution. i serach for all previus server name entry in registry and repalce all by new parent name. but i have to wait till tomarrow to see if it works well or not .

any idea about this problem ???