can i run linux mandriver x64 with windows x64 bit if so wich one should i install fi
 

i have downloaded linux mandriver x64 can i run it on sata raid with windows x64 if so wich one should i install first

Yes you can, and there is plenty of information here on how to. (Although i find Win xp 64 a pile of junk)

As for installing first, has to be windows, otherwise doing it second it'll cock up the bootloader.

If you have the choice, indeed install XP64 first, Mandriver next. It is however possible to do it the other way around (you might be forced to do so when you have/decide to re-insztall Windows and don't want to install Mandriver again).