Possible Duplicate:
What’s the difference between Wubi and a regular installation?
Is there any way to install Ubuntu on NTFS?
Because my files are in that drive, I wan't to dual boot between Win7 and XP.
Possible Duplicate:
What’s the difference between Wubi and a regular installation?
Is there any way to install Ubuntu on NTFS?
Because my files are in that drive, I wan't to dual boot between Win7 and XP.
Easiest is way is to install via WUBI, refer to Installing ubuntu with windows 8
Otherwise, it is possible for ubuntu to be installed on its own partition, while sparing your NTFS partition(as long as you have the space) and even access it from ubuntu if needed.
You would need to partition the disk in any case, so you may as well format the partition(s) for Ubuntu as normal (ext4 etc) and your NTFS data files will be accessible from within Ubuntu, but Windows won't see your Ubuntu data so you should consider where to store things that may need to be accessible from both i.e. put it on the NTFS (Windows) partition.
The installer will do the partitioning for you and give you dual boot if you choose the "Install alongside Windows" option.
NTFS does not understand Linux permissions so that is a no.
It is fairly easy to create a new partition with a Windows program like Partition Magic that you then can use for Ubuntu. Just have to be careful when using it so you do not destroy any data.