I have been having some trouble figuring out where I configure the installation path for my published application

right now it seems to be defaulting to install in:

c:\documents and settings\username\local settings\apps\then a bunch of random gibberish folders

I'd like it to install in say c:\program files\application name etc.

I've tried changing the publishing settings but when I change the installation folder url it gives me an error like
Code:
Publish.InstallURL:
The string must be a fully qualified URL or UNC path, for example "http://www.microsoft.com/myapp" or "\\server\myapp"