Here's the link.. A lot of information, so read all the posts.
http://forums.cnet.com/5208-12546_102-0.html?forumID=133&threadID=243153&messageID=2460401
Hope this helps.
Grif
I had a windows xp media center edition 2005 a couple of weeks ago, until i received some software problems and i thought that it would better for me to upgrade to windows xp home prmium(an express upgrade from hp). But before, i made some recovery disks(i dont know how they work) using hp recovery cd/dvd creator. So now i am having a couple of more complications.
In other words i want to downgrade from vista to XP...
But i dont have any idea how.
Thank you in advance!

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic