To my knowledge, Mandrake doesn't have any issues dual booting with WinXP.
Fedora Core 2, however, has. You should cast your eyes over this article: http://lwn.net/Articles/86835/
and do a search here at LQ for dual booting FC2 & XP before you take the plunge and install FC2.
I ran Mandrake 10.0 alongside XP without any problems - the default Mandrake bootloader (lilo) even detects Win partitions automatically and adds them to the boot list so you don't have to configure it when the install is done.
Both Mandrake and FC2 are good, solid distros, but I can only recommend Mandrake as I actually use it - so much so that I don't have Windows on my box anymore.