DailyTech - DailyTech reported on Monday that Microsoft no longer performs disc checks during an operating system install. In the past, when performing a clean install, a user could boot from an install CD and insert a disc from a previous version of Windows for upgrade compliance. However, per Microsoft's new licensing requirements for Vista, users are required to install a Windows Vista Upgrade from within Windows XP. When this occurs, the Windows XP license is forfeited and the Windows Vista installation process can take place. DailyTech has confirmed a new workaround proposed by Paul Thurrott (via Microsoft internal documents).