Correct deployment tool to copy files & run SQL Script

What would be the best way to deploy upgrades to a piece of software with the following requirements:

The upgrade:

• Must be run from a client machine, not a server.
• Must Show a dialog to select a network location and copy files to a share.
• Must show a dialog to enter SQL Server connection information and the upgrade must connect to SQL Server to run an upgrade script.
• Must not change anything on the client machine from which the upgrade is run. (Nothing in Add/Remove programs, registry, etc. I.e. no Windows Installer.)
• Must not rely on any additional dlls or frameworks. The user must be able to download a single file and run it from Windows XP SP2 without having to install anything else.

Some things I have looked into:

• Batch files (can’t show a dialog to allow the user to enter connection information)
• OSQL (can’t show a dialog and can’t copy files)
• WiX (runs on top of Windows Installer so it puts开发者_开发知识库 things on the client machine from which it is run)
• Custom C#/VB app (requires .NET framework)
• Winzip/WinRAR (can't show a dialog, can’t run SQL Scripts)

If you don't want to rely on any dlls and frameworks, you should make a native app, this can be, for example, custom winrar sfx (you can run additional scripts after extraction, this can be a batch that executes sqlcmd).