from the looks of that doc , the roll back looks pretty simple. but again you are going to an OS that is essentially dead.
while this sounds complicated , you can create a bootable dvd-r or usb that would allow you to try linux...

great thing about linux is old hardware is not an issue ... heck I know one version that supports the old pentiums from early 2000's


but linux is one of those things that sounds a lot harder than it is