That's not nearly as easy as you make it sound.

Now, when you install the drivers, I'm not sure if Vista has the same driver setup as XP (I didn't use Vista for long, didn't like it much, and it didn't like my computer much), but you should be given a "Have disk" option when installing the webcam. Select this, and then there should be an option of something along the lines of "Don't search, let me choose the driver to install". Click this, then navigate to wherever you extracted the .zip to, and find the driver file inside. It should be a "*.inf" file.