Ask for login during installation

Hi to all,
I am doing an application in which I have some unusual requirement, that is I want my application to ask for login (only username is required) while I install the application i.e; during the installation wizard and save it at that time only, so that the application will not prompt user again for login in future.

I know how to achieve this after the application is installed by using the shared objects once the user login.

Is there any way to achieve this?
Any help would be greatly appreciated!
Thanx.