You can install the Vista one for 7. I'm using it now. The XP one (2.1) and Vista one (2.6) are nearly identical and both run on 7 just fine. That much I can attest to. Live Movie Maker lacks a lot of effects, the ability to fine-trim, add a lot of transitions, and export into various formats other than WMV. Once I downloaded it, I immediately began searching for the older versions.