If you are looking for a key to activate an old machine, the physical sticker on your hardware is your only official source, as Microsoft no longer sells or provides new Vista keys.
Before searching for a product key, you must understand what Vista Starter actually is. Unlike Windows 7 Starter, which was limited but usable, Windows Vista Starter had severe restrictions: windows vista starter product key top
This is the for archival use.
If you simply want to install Vista for retro gaming or nostalgia, buy a second-hand DVD copy from eBay—it comes with a legitimate key that will work for installation, even if online activation fails. Keep that machine offline, and enjoy the Windows Vista experience exactly as it was: beautiful, broken, and unforgettable. If you are looking for a key to
However, the you have gained today is that you do not need a key to run Vista Starter indefinitely (use slmgr -rearm ), and you should probably upgrade to Linux for real usability. If you simply want to install Vista for