I have exactly the same problem as mentioned in the link below.

http://www.d-a-l.com/help/showthread.php?t=30984

The difference is that I do not have the XP cd which was used to install XP on my system. Do i buy a new CD?
I am really worried about losing my data!!!
Guys please help me ...I am not computer whiz like you...
Please xplain me in a simpler lingo

Thnx