If you want to retrieve the data, download something like Ubuntu that has a 'live' session, so the operating system runs off the disc. Try using it to access the harddrive and get everything you need off, incase you can't get it fixed. I'm not sure whats damaged, the partition or the operating system, as the error shows things about ntfs.
If I run into any issues with Windows, the best thing to have as a backup is the boot disc, but since you don't have it, then I have no idea. I researched a little and the chkdsk thingy was recommended by many people and in some cases fixed the issue. As for torrenting the disc, I don't know if XP relys on the same disc it was installed from. If you want to, give it a shot, unless someone else knows another way, or knows it won't work.