Well one thing at a time..
Linux uses a different filesystem, but CAN read and write to fat32 partitions. So.. you could move your data to a fat32
partition and still have it afterwards. You will deal with that during the partitioning part of the install.
Now about the other stuff. Browsers.. There are lots,
firefox,
opera,epiphany,seamonkey, iceweasel, konqueror, kazehakase, galeon.. take your pick. Most major variants come with the one the developers like, or which suits the desktop/system .
DVD manipulation is a bit of an art.. tools depend on which way you go, which desktop you have and how complicated you want to get. Forget the windows methods, they don't work.. linux is a little more hands on, and we don't like talking too much about breaking the encryption (
it's easy.. just we don't like telling how easy because hollywood is watching and it uses illegal software for the usa)
Leave all that for now.. one thing at a time. Test your hardware..
Download and burn a live mini distro to check all your hardware. There shouldn't be anything too unusual in an old machine like that.. certainly easier than trying to find windows drivers for it.
What I would suggest for a
starter pack is puppylinux
http://www.puppylinux.org/downloads take puppy4 (dingo) it works very well, and burn as an
image file.. just like any other image. Then change your bios to boot from
cd and reboot. there will be a few questions.. don't worry, you can't break anything just running it live like this and you will find out about your graphics hardware while you are booting.
Success with the startup wizard will give you a nice desktop.. all running from the cd. Try the connect icon (one click usually, not 2) and get online. Fire up seamonkey (the world icon) which will get you puppys starting off page.. read and see what you want to know about ;)
How easy is that? I would suggest playing with it like that for a while and getting the feel before jumping in with a full install of a larger distro. You can install puppy in a minimal fashion to the hdd and use it to backup data if you want, but I wouldn't bother saving any windows programs.. you will not need them.
My house has now been completely windows free for 4 years. Don't miss it either.