Win2K Product Key Question

I have a client that has been running a Pirated version of Win2K for a while. I talked him into buying a legit version and he has. Is there anyway I can change the Product Key in Win2K without reinstalling everything? Does it even matter now that he has a legit license?

We talked about this in another thread a few weeks ago regarding XP (sorry, no link). I think the general concensus was just keep the old version going, and you Now Have Done The Right Thing.

I don’ t think a product key changer has come out for Win2k like it has for XP because people were having problems installing XPsp1 with illegal keys and I don’t think that problem exists with 2k.