This script will generate a template .NSI file for your application (that will then need a bunch of editting to make it useful). The generated scripts require NSIS v1.3+.
First, fill out the form the best you can, then save the script, then edit it while using the documentation to make it do what you want.

      Love, Justin.

P.S. Don't use any double-quotes (") in your values here.
P.P.S. The PHP source for this script is here.

Application name (short, usually one or two words):
Company name (can be empty):
Output EXE name:
Uninstall support
       Uninstall text:
       Uninstall exe name:

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Show license page
       License text (goes above the license):
       License data filename of a .txt file on the compiling system
       (note that the pathname can be relative (to where the script file will be saved) or absolute):
      

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Default installation directory (recommended name: $PROGRAMFILES\myApp):
Show directory page
      Directory page text:

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Optional install sections
            Description text (goes on top of page):
            Install types (up to 8, colon delimited):
            Name of default (required) section (blank for none)
            Optional Sections (colon delimited):

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Generate as text for viewing (default is to generate an .nsi file for download).