Change product key in Visual Studio 2008 Standard Edition

I erroneously used the same product key for VS2008 on two computers. I would like to change the key on one of them. Answer from here tells where I can find the key in registry, but I couldn't find anywhere on Internet if I may actually change that value in registry. There are some answers that changing the key is impossible. What should I do then, reinstall whole Visual Studio just to change the key?

How to replace product key for Visual S开发者_StackOverflowtudio 2008?

EDIT (see OP comments):

support solution: reinstall...

or

[the following woks with Trial version (does not answer the question)]

try control panel->add/remove programs->change/remove-> enter a new product key

or

%ProgramFiles%\Microsoft Visual Studio 9.0
               \Microsoft Visual Studio 2008 Team Suite - ENU\setup.sdb

search for [product key] and change it

more info here...