Unnecessary Repetition
In Windows XP, you’re asked to repeat your wireless network password, which is really quite meaningless because if the password is invalid, you won’t be able to connect to the network.

While one might argue that there are several things that might prevent you from connecting, a bad password is likely your problem.
Microsoft got this one right between XP and Vista.

Peripherally related are cases where we ask users to repeat themselves even when they can see the data they are entering. It is not uncommon to see this strange phenomenon with email addresses.