is there a way...

is there a way to create a prompt that pops up like a messagebox, possibly during the file install process, but has forms like a custom page

I'm sure there are plenty of other ways to accomplish my goal but I was just wondering

I suppose I could create a second installer consisting of one custom page and embed it in my main one, kinda sloppy way to do it though

You can use nsWeb's ShowWebInPopUp.