Dual Booting FreeBSD or Linux with XP

Will I have to install either FreeBSD or Linux on a separate partition as Windows XP? And will there be any conflicts and stuff? I wanna use FreeBSD but if there would be problems I'll settle with Linux. I haven't decided which distro yet but that'll be later.

>>11
Insightful
So what happens when that happens? I mean, if I activate writing on NTFS somehow, and an application tries to create a file, will it get a permission denied error perhaps?