bad serial number given in setup

[bad serial number given in setup]

I have the same problem.

If i install and run the game, play for a while and then quit the game myself, there's no problem starting it again later.

But if i play the game and it crashes (blue screen of death) i get the "bad serial number given in setup" message.

So it would seem that the crash corrupts the game.

os: xp

gfx card: GeForce GTX 260

game: bought retail (not downloaded)

lang: EU

patch: 1.02