Your problem is difficult to understand Brian as you seem to be losing your ability to speak /write cohesive English. Perhaps it comes with living in France.
You have failed to mention what components are being upgraded, will it mean a reinstall of Windows XP? if so the just install a new copy of Steam but save the steamapps folder from your current installation which you can then copy across to the new steam folder,that will save you reinstalling your games. You can also Google where the games you have keeps the game save folder and make a copy of that also,or you will have to start your games again.
Or you could just phone me and I'll do it from here.