Skinned Aussie !
This forum on "Ubuntu Installations" is really scarin me, with all the endless threads of people having installation issues, now that I'm about ready to take the Ubuntu plunge
Help me, man ! These threads are painting a bleak picture !
Ubuntu Forum : Installation & Upgrades
With the plethora of machine builds out there, spanning the last 15 years, that sort of thing should be expected from a free, community built and maintained OS.
There are a lot of people that don't follow instructions... there are a lot of people that wont read what the actual error on the screen says and think about it... or don't know how to handle anything that doesn't go exactly right and throw their hands up... or use really old equipment, or have some obscure equipment that causes some weird random problem no one has seen before. Those are just facts of life, when it comes to technology there are people that just 'don't get it'. There's nothing wrong with that, for those of us that get technology there's tons of other things in life we 'don't get' that seem simple to others. In addition to that, sometimes there are just crappy situations that are completely out of the hands of the user - it would have happened if they were an expert or novice. It's just the way life is.
Anyways, all of that is to say that if you're going to change OS's on an old machine you run those risks. Especially if it's a free, community built/maintained OS
All i can say is that from the few of us that have voiced that we've used Ubuntu, all of us have been happy with it. Your mileage may vary
You can download the boot-to-cd image and boot to that without altering your computer in any way. If you can boot to that and use the computer for an hour or two without any problems then you **should** be able to install it without any hardware problems. Booting to that CD will run that OS on your hardware, it's just running it from a CD instead of your hard drive - you just pop the CD out and restart, you're back in your windows environment.
You can read about the boot-to-cd download and instructions here. You can also just use a USB flash drive.
http://www.ubuntu.com/download/desktop/try-ubuntu-before-you-install
You can also download a file and run it while you're in windows. It'll 'install' ubuntu like a program. When you restart your computer it'll ask if you want to go into Ubuntu, or if you want to go into windows. You can choose. Both will be functional. If you get tired of ubuntu and want it gone all you do is go into windows, open up add/remove programs (start -> control panel -> add/remove programs) and uninstall Ubuntu. I've used this before and it worked great. This may be the best way for you to go forward - if you like ubuntu just always boot into it. If not, remove it. Your computer should otherwise remain unchanged. Though you'll have to have enough hard drive space free to use it.
http://www.ubuntu.com/download/desktop/install-ubuntu-with-windows
These are just the facts of life when it comes to computers. Too many variables (manufacture, combined parts, age of sytem, etc) to guarantee anything. The only thing we can say is that there are a few of us willing to help you if you get stuck, when we have time. That, and if you back everything up appropriately and your computer gets screwed up and you want to go back, you can.