If you have windows XP SP3 Zune software should install without a problem,it will only transfer media related files. As for the SkyDrive PC plugin, it is not supported in XP , see this page:
I can't load the SkyDrive app on my pc (xp with sp 3) - Microsoft Answers
The web version should work however, so that might be an option for the other files.
Welcome aboard to the WP side.