I too have installed FC4 and iam able to mount ntfs partitions. Its simple just type uname -a and check for ur procesor series and other info and make sure u down load the correct rpm for me uname -a gave something like
Linux homemachine 2.6.11-1.1369_FC4 #1 Thu Jun 2 22:55:56 EDT 2005 i686 i686 i386 GNU/Linux
means i have to download rpm for i686 processor and also make note of the kernel version and download the correct one. I think if u follow the link below u might find some useful info
The instructions above made it work exactly , no hussles nothing.