Hi I lost my Product Key for my Windows 7 Professional....how do I find it or get another for it?

If its an OEM System Builder disc, you are responsible for replacement of the product key if you lost it.

How to obtain a replacement product key
If the software came preinstalled on your computer, please contact the manufacturer of your computer to obtain a replacement product key.

To replace a Microsoft product key for a product you purchased separately from your computer, you must contact Microsoft Customer Service and Support. To locate the appropriate telephone number, visit the following Microsoft Web site:
Contact Microsoft (http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS)

OEM versions of Windows 7 are identical to Full License Retail versions except for the following:

- OEM versions do not offer any free Microsoft direct support from Microsoft support personnel

- OEM licenses are tied to the very first computer you install and activate it on

- OEM versions allow all hardware upgrades except for an upgrade to a different model motherboard

- OEM versions cannot be used to directly upgrade from an older Windows operating system 

OEM licenses are to be installed by professional system manufacturers only. Under Microsoft's OEM License Agreement, they are not to be sold to end-users under any circumstance, and are to be preinstalled on a computer using the OEM Preinstallation Kit (OPK) before shipment to the customer, and must include at the very least the manufacturer's support contact information. They are, therefore, designed for installation only on a single computer and are not transferable, even if the original computer is no longer in use. This is not usually an issue for users who purchase new computer systems, because most pre-assembled systems ship with a preinstalled operating system. There are few circumstances where Microsoft will allow the transfer of an OEM license from one non-functioning system to another, but the OEM System Builder License Agreement (SBLA), as well as the OEM End User License Agreement (EULA) do not contain any allowance for this, so it is entirely up to Microsoft's discretion, depending on the situation

http://www.microsoft.com/oem/en/licensing/sblicensing/pages/licensing_for_hobbyists.aspx

If you have installed it then try the following key finders:

Belarc Advisor: http://www.belarc.com/free_download.html
(It does a good job of providing a wealth of information.
Also: http://www.magicaljellybean.com/keyfinder.shtml
and: http://www.nirsoft.net/utils/product_cd_key_viewer.html

Paid (Free demo available): Recover Keys: http://recover-keys.com/
"quickly analyzes your system for over 3000+ software programs
and produces a list of software activation keys"

13 keyfinder programs:
http://pcsupport.about.com/od/productkeysactivation/tp/topkeyfinder.htm

 

J W Stuart: http://www.pagestart.