It is really annoying but its used for security measure as you know.
We can also disable this UAC but in future if you face any pop-up issues you need to enable it
The way disable the User Account Control is
Start --> Run --> services.msc
It will display you the list of services and from there you can disable this services
Select the "User account control" services double click on it. Change the status to "stop" and startup type to "Manuall".
Then that particular service will get stoped then you wont get any pop-up.