UAC is not a security feature&#x2F; boundary (even according to MSFT themselves). It was aimed to help stop ISVs from writing software assuming admin privileges.<p>Vista had A LOT of security improvements overall, but UAC shouldn&#x27;t be considered as one of them (similar to PatchGuard for x64 Windows - it&#x27;s cited as sometimes a security feature, but it&#x27;s not).