Well if you are using mandrake, it's about as easy as installing windows... As for the dual boot, it'll be installed automatically, you just have to configure it (the boot manager is called LILO, for Linux Loader I think). Be careful though, the first time I installed mandrake, the waiting time in LILO was set to 1 seconds, so linux was automatically loading after 1 seconds...Took me 2 days to figure out what was the problem LOL
Hope it helps you
