If there was no error during installation then the NTFS volume can be mounted in read-write mode for everybody as follows. Unmount the volume if it had already been mounted, replace /dev/hda1 and /mnt/windows, if needed.
ntfs-3g /dev/hda1 /mnt/windows
You may also need to set the 'locale' option to make all file names with national characters visible. Replace the below hu_HU.utf8 with the appropriate setting.
ntfs-3g /dev/hda1 /mnt/windows -o locale=hu_HU.utf8
Please see the ntfs-3g manual page for more options and examples. You can also make NTFS to be mounted during boot by adding the following line to the end of the /etc/fstab file:
/dev/hda1 /mnt/windows ntfs-3g defaults 0 0