Before asking here or on the <debian-user> mailing list, you should read the Installation Guide,
or if you already have Debian installed, the Debian Reference.
Also take the time to read:
Linux is NOT Windows : http://linux.oneandoneis2.org/LNW.htm
What we expect you have already Done. : http://forums.debian.net/viewtopic.php?f=30&t=47078
Please read "How To Ask Questions The Smart Way" - http://catb.org/esr/faqs/smart-questions.html