TS3212 User Account control is asking me " Do you want to allow the following program to make changes to this computer? then it asks me to type an administrator password - ?

Question

What Username and password is the User Account Control program asking for to complete the 10.7 download on my PC? It asks do you want to allow he following program to make changes to your computer.

Answer 1

The updated version of iTunes is a change to your computer, and the computer is trying to protect itself against unauthorised changes that could damage it (in other words, hacking, trojans, viruses etc.).
On your computer, you are using a User Account; imagine that it's your part of the computer. Each user on the computer is either an administrator (who can make changes) or a non-adminstrator (who cannot make changes) to the computer itself.
Do other people use the computer as well, such as your parents, who may have restricted your ability to change programmes on the computer?
Or is the computer at, and owned by, your school, or in an office? If so, their computer department has created an account on the computer for you to use, but not change.
In either of the above scenarios, your account will be a non-administrator account. If it's your parents' machine, perhaps they have an administrator's account.
If you are the only user of the computer, or there is only the one account on it, then presumably, the administrator password is one that you have set up.