GParted is a world class rescue and partitioning tool that will allow you to save your old computer operating system, and failing that will allow you to export the files off of your old hard drive and back them up to external media. It may not be as intuitive as a lot of other Linux builds, requiring you to go through a bit of a learning curve before you can use it, but trust me when I say it is well worth the time and effort spent to get there. And since it is a Live Disc application, you never need to install it to a hard drive. Download it, copy it out to any media type your computer knows how to boot from, and run it from there. Myself, I have almost never used it to partition a hard drive, because I so rarely do that. But rescue files off a corrupt disc, external drive, or memory stick? That I do pretty much every day, and this is one of the better tools in my arsenal for that task. Try it out and see if you don’t find it useful as well.