How to install an application on Windows without admin privilege

How to install an application on Windows without admin privilege?

In a corporate or university or school environment, it will be many times the case that users don't have admin access. And there are lot of application (mostly free and/or open-source) which are "just" applications and don't need admin privilege, but when you click on the setup file (exe or msi), it will pop up UAC dialog. I remember I was able to install these applications in Windows XP without admin privilege.

I noticed that when I try to install Microsoft Live Mesh or Google Chrome Browser, they don't pop-up UAC.

Here is my conclusion based on these observations:
The installer for Microsoft Live Mesh and Google Chrome Browser were updated for Windows 7 (or may be Vista) and the installer for other "non-admin" applications were not. Windows 7 detects that these installers were written for Windows XP and older, so it pops up UAC. Although Microsoft implemented a feature but it is broken. In a nutshell, a user should be able to do non-admin stuffs from non-admin account if she was able to do in Windows XP.

Update:

I found it:

"Local Policies -> Security Options -> User Account Control: Detect application installations and prompt for elevation" -> Disabled

Now it will not prompt UAC for installers. So when installing application if you want to give admin access to an installer, right click and select "Run as administrator."