Well, thanks for the advice, but I did the update and reinstalled the drivers. I had to do that many times until all the drivers finally worked after the update.

However, there were some options that I lost, like the USB recognition of my pendrives or USB disks.

So, I decided to reinstall everything and now I have tri-boot in my Laptop:
-Windows Seven
-Windows XP
-Leo, my dear Leo (:

xD