It is a real trouble to install the freeBSD first time, so here is a quick installation guide. 

Dual Booting

If you want to dual boot your machine, use any disk partition utility and create a new parition, or you can shrink your existing partitions to make room for freeBSD. Use PartitionMagic or similar program for windows to perform this task. It is also adviseable to backup your data.

Getting Media

I am not going to say much about this. There are links to various ftp mirrors at www.freebsd.org and the directory structure is fairly self-explanatory. There are however several choices for ISO. You should choose the miniinst ISO. It is small and will include everything you need for the base system.