pragadeesbgmail.com

Dear all, I am using windows server 2008 enterprise edition sp-2 in my server, and I have client machines runing windows 7, windows vista and windows XP OS. when ever i will transfer a file from server to clients which have windows vista and windows 7 os, then the server will hang (adove 100 MB) and vice versa (server- Client, client-server). In windows XP its working fine .how can i solve this problem?

I ve installed network card rtl8139d but its not working properly plz help any body,