You don't need IIS to develop using Visual Studio as it comes with a built in web server.
Also, the installation or otherwise of IIS isn't really a .Net related issue, so doesn't belong in this forum
Also, please (PLEASE) do the simplest of google searches before asking simple question. A search for "IIS vista" gives perfectly adequate solutions to this simple problem. I would call you lazy, except registering on this forum and then writing a 100 word question, and then having to wait around for a response is far more work than just doing a 2 word search yourself and getting the answer instantly.
/- Sam Judson : Wrox Technical Editor -/