i have lost my pruduct key windows xp

[klenshin]

i have a laptop (DELL) it did not have OS in first . i had to buy a windows xp cd and with a product key. i installed this windows on my laptop and registration of windows became complete without any problem .
after a long time for a reason  i had to format hard disk then i lost my windows xp when i wanted to reinstall windows xp i recognized  i have lost my windows xp's product key and i cannot install windows now and  i dont have OS on my laptop
how i can go to microsoft site and get my registration information such as product key and my laptop information on microsoft datbase .
please help me about it
thank you

[stevejohnson1958]

First thing I'd do is give them a call at  1-800-936-5700, to see if they can provide you with a valid key.

[NOT ADMIN :P]

while you are waiting, i would DL linux (free) and burn it to a bootable disk (using nero or other software) at least this way you arent stuck without a computer for a fe days / weeks

Is linux better than nothing?

Ofcourse it is!

[Dusty]

Is linux better than nothing?

Of course it is!

But slightly behind FreeDos

[CBMatt]

In my experience, Microsoft is usually pretty helpful in matters of this nature.  Give them a call like Saviour suggested and see if they can help you.

[quaxo]

I don't know where Dell puts their "Authentic Windows" certificates, but some manufacturers put the sticker on the bottom of the laptop.

-=EDIT=-
Oh, scratch that. Just re-read and saw you bought your own copy of XP. 

[Broni]

i had to format hard disk

...and you didn't bother to check, if you have CD, and a key? Hard to believe.