Hi,
Firstly you need to create a 'dummy' directory on linux which will serve as the mount point. You can call it what you like but by convention it would be a sub-directory of /mnt. For example:
mkdir /mnt/win
Then you use the mount command to mount the partition at that mount point. For example :
mount /dev/hda1 -t vfat -o ro /mnt/win
(substitute your real windows partition if its not /dev/hda1. This example shows read-only)
If you want to regularly mount this partition then you would indeed but an entry in /etc/fstab. If you use the 'auto' option it will be mounted automatically at every boot. Otherwise, you'd have to mount it manually each time with 'mount /dev/hda1' or 'mount /mnt/win'. Unmounting, incidentally, is done with umount (not unmount!) - for example 'umount /dev/hda1'.
All you windows files will be found in the linux file system under the mount point directory. For example, using mount point /mnt/win, the directory '/mnt/win/windows/system' would be equivalent to 'c:\windows\system'.
Rgds