I know that I can change the property in advanced setting of the shortcut to run one app as administrator. But is possible to do that for all my application? There is a general setting or something somewhere that can tweak that?
You can disable UAC entirely from the control panel, this will mean all programs (installed, downloaded, background, everything) will effectively run with the privileges you currently have to grant manually (via UAC pop-up or compatibility settings).
I think this is what you are asking for?
However, I highly recommend against doing this; it lowers the security of your entire system by allowing any program to modify your system.
In Windows 7 you can adjust the level of UAC to suit your needs. In decending order of strenght, the settings for Win7 are:
You can always just logon as the "Administrator" account.
Or, just set UAC to never prompt you, and then all the apps that need admin rights will get it, without you needing to do anything. Just search for "User Account Control" on the Start Menu.
Just so you know though, this is very dangerous. Any malware will have full admin access!