lost my product key to reinstall windows xp, how can I get them without buying a new window, not on tower and can find my cd case with #s____

How To Obtain A Replacement Product Key

Windows Preinstalled:

If you have a lost or unreadable product key for Microsoft software that came with your computer, please contact the manufacturer of your computer to obtain a replacement. Contact information for the manufacturer of your computer can be found here:

http://support.microsoft.com/gp/oemphone/

Retail Windows:

If you have lost a product key for software that you purchased separately from your computer, or if your product key is not working, please call Microsoft. To locate the appropriate telephone number, visit the following Microsoft Web site: http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

A fee may apply for lost keys.

Product Key - Where To Find Product Key 

1. If you bought a computer with Windows preinstalled there should be a Certificate of Authenticity (COA) sticker somewhere on your computer, on some laptops it’s in the battery bay. It will have a 25 character alphanumeric code on it - that is your product key. If it's not on your computer look in your paperwork or on any CD/DVD cases that were included with the computer.
2. If you bought a retail copy of Windows 7 the key should be included in the box.

cant find product key to reinstall windows xp and dont want to have to buy another what can I do? looked on tower, not there, dont have cd no more, HELP

I lost my cd key but i have original copy

lost my product key but have my install cd

If the system is still running and this is not an OEM machine (HP, Dell, etc.) you can use one of these free utilities to get your Product Key:

http://www.magicaljellybean.com/keyfinder.shtml

http://www.nirsoft.net/utils/product_cd_key_viewer.html

If the computer is an OEM machine, this will not be useful since the key shown will the OEM's volume license and not one you can use. In this case, contact the computer mftr. to purchase recovery media.

If the system is not running and the computer is not an OEM machine (one you built yourself or had built for you), you will need to purchase a full retail copy of whatever version of XP you want.

If you had a retail copy of XP which you have lost and the system is not running so you can't retrieve the Product Key:

If you have lost your XP product Key , the best option is to call Microsoft. Call on Microsoft Licensing Fulfillment Center Toll Free Number (800) 248-0655 Monday through Friday, 6:00 A.M. to 3:00 P.M. Pacific time.

Contact Microsoft page - http://support.microsoft.com/default.aspx?pr=csscontactfind

How to Replace Lost, Broken, or Missing Microsoft Software or Hardware - http://support.microsoft.com/default.aspx?scid=KB;en-us;326246

MS-MVP - Elephant Boy Computers - Don't Panic!