You can boot into safe mode (or log off of your user and tap ctrl, alt + del at the login screen to access hidden admin account) and use the default administrator account. You may also want to creat yourself an account that has admin rights.
As a user without administration rights, installation of programs is impossible (security feature). If you do not have the administrator password, you will not be able to add/install/update programs at all. If you were provided the administrator password, use the method shown above to access the admin account - sign in there, then update/install. After installing (and checking for new updates), sign off the admin account and run from your user account (for security).
I personally wouldn't bother making a new admin user - which you need to be logged in as admin to do anyway.