How to change Product Key of Visual Studio Team System 2008 Team Foundation Server

Today my pc show me that the "Microsoft Visual Studio 2008" installed will be expires, and I find it is just a trial version.

God save me.

In the web , I found some genuine version cd-key, 

PYHYPWXB3BB2CCMV9DX9VDY8T

RK4HRRHB4K6JCGPRDCYYQ6RG6

In order to enable changing the license key the following steps must be taken:

1. Open in notepad the following file "%ProgramFiles%\Microsoft Visual Studio 2008 Team Foundation Server\Microsoft Visual Studio 2008 Team Foundation Server - ENU\setup.sdb"

2. Locate the [Product Key] section

3. Change the 26 license key to one that listed upon.

4. Run again the Change/Remove for Microsoft Visual Studio 2008 Team Foundation Server - ENU from Add or Remove Programs

5. The CDKey entry should contain the new license key or should enable to edit it (in case of a trial key)

The path and the name of the entry in "Add or Remove Programs" is different for installation in different languages.