A Win server is expensive for file server only use. Do you whant to run any server programs from it? If not, go for a NAS instead (QNAP, Synology, Thecus,..). It's easier to configure and has all you need for a file server.
I agree with you.. maybe I can use NAS..I have read about it.... my problem is I dont know how to configure it..
I need to assemble this as in from the pieces of computer.. like cpu, motherboard,ram, etc..