yes, you can install windows after linux, and this is in fact necessary, since windows needs to be periodically installed to function while linux needs nothing of the sort.
the way to do this is to install windows, then after you've got bored of rebooting six hundred times to install your drivers, you get your linux bootdisk (which you made during your linux install), and boot from it. the machine will boot from the floppy, the floppy will find linux on hda2, and you'll be able to boot linux as normal.
If you like, you could leave it like this, if you have windoids that you want to be kept out of your linux side, but ideally, i'd say you should now login as root, and run: '/sbin/lilo' which will rewrite your lilo booting info onto the hard drive's MBR, and you'll get your normal lilo thing next time you boot your computer.
Aha! i just realised this is lilo specific so can anybody answer for what to do if GRUB was being used?
ta.
(i know i said i'd stop helping people, well, you can go ahead and insult me now).
[ November 25, 2002: Message edited by: Calum ]