Invalid key

[RAF_Loke]

Had to re-install XP and therefore also FSX.
Now it tells me that it's an invalid key I'm using  >:(. What the h**l is going on here?

[Domj122]

Try it again making sure you dont mistake your O's for a 0 etc if all else fails, call up microsoft.

[RAF_Loke]

There are no o's for 0's or versa visa. I checked M$'s page and you are right, I will have to call them  >:(.
I don't mind security and understand that they like to protect their product. But this is to much  >:(.

[expat]

You could try the online option to register. It takes about 2 minutes. I have installed FSX twice on the same computer and was  able to register a second time without a problem.

Matt