I had installed NWN on WindowsXP but after the XP crash i turned to FEDORA 10.Now i am able to use and access the Windows file directories and the .exe files in them using WINE.
Though WINE is running well but NWN is running very slow..
MY system is more than compatible to run this game as you can see from my system configuration
DualCore 2.6 GHz processor
1 GB ram
NVIDIA Geoforce Graphic Card 256 MB

Do i need to do something about DirectX in WINE??
and how can i check whether my graphic card is being utilised?
please help me

There is a native NWN client for Linux, use that instead:
http://nwn.bioware.com/downloads/linuxclient.html

As H_TeXMeX_H said, run NWN natively. It runs great! They even have a Linux section on their forums if you need any help.

Before i might try running NWN on Linux i must share a fact that i had allocated only 10GB hard disk space to Fedora10 while installation as rest of 150GB is used up by Windows XP(which is currently crashed)...i am not able to Format my WINDOW XP so I am relying only on Fedora10( my system is Dual Boot)..
I am able to access my Windows files via Fedora10 and WINE. But installing NWN again... that too its DIAMOND Edition... would at least ask for 4 GB space which is not available in Fedora.
So i tried to follow tha advice and Tried to run from WINDOWS Installation using Linux Client from http://nwn.bioware.com/downloads/linuxclient.html but fixinstall executable file is not running nor the nwn executable file for Linux...
Please Help!!

Since you can't boot into Windows I would suggest backing up everything and then reinstalling, either with Fedora on the whole drive or dual booting with more space allotted to Fedora.

I'm not sure if its ideal but as long as you have write access to the window drive, and if you don't I would recommend installing ntfs-3g, you could install it to the window drive.