I hate installers too, which is why whenever possible I'll pick a no-install program.

Forget all the installer stuff, download an exe and run it and there's the program. At the most, download a group of files, extract them into a folder and run, and there's the program.

Definitely keep the advanced and simple choice when "simple" means "we install the toolbars you would never choose if we asked".

Also dump the freaking download managers (Adobe, Microsoft) and FEAD Systems Optimiser (Adobe) and the download-a-program-which-downloads-the-installer (Microsoft .Net framework).