Is it possible to install any software without using ADMINISTRATOR PASSWORD

Is it possible to install any software without using ADMINISTRATOR PASSWORD? Or is it possible to install yahoo messenger without using administrator password?

If you are the Administrator of the said PC than there is noting to talk on it, it will do for sure. ANd if you are not the Admin and have limited rights, than there is no way to install any of the application without entering Administrator Password. That is the great part of security in Windows. :bleh: