Though it certainly makes u work a bit harder but u can deal with MBR problem, even if u Install Linux first.Don't worry , if installation of windows overwrites lilo or grub linux boot loader.

just boot the system with linux bootable cd
then choose following option

boot: linux rescue

it will detect existance of linux and ask you to execute
following commands
#chroot /mnt/sysimage

after mounting you can acces all the directories of linux
to reload grub

# cd /boot/grub
#grub-install /dev/hda

to reload lilo
#lilo

it will reinstall grub or lilo in MBR
simple , isn't it

Is any moderator reading this, if yeah then do tell if anythings wrong in it.Though im confident it is not.
Urs in Health,
Prady.