Try these 5 very cool transformation packs !
Vista, Mac OSX, FlyaKiteOSX, Fedora and Ubuntu. All directly on your Windows XP :D
More info and downloads available at: http://www.makeuseof.com/tag/5-packs-to-transform-windows-to-other-os/ [10]
Links:
[1] http://linux.philosweb.com/drupal/category/it/software/software/os/microsoft
[2] http://linux.philosweb.com/drupal/category/it/software/os
[3] http://linux.philosweb.com/drupal/category/it/software
[4] http://linux.philosweb.com/drupal/category/it/visualization
[5] http://linux.philosweb.com/drupal/files/image_2_118.png
[6] http://linux.philosweb.com/drupal/files/image_4_43.png
[7] http://linux.philosweb.com/drupal/files/image_6_18.png
[8] http://linux.philosweb.com/drupal/files/image_8_12.png
[9] http://linux.philosweb.com/drupal/files/image_10_7.png
[10] http://www.makeuseof.com/tag/5-packs-to-transform-windows-to-other-os/