Follow the instructions as shown in the video and below are the commands you will need. Windows Longhorn build 4074 is a Milestone 7.2 build of Windows Longhorn. It is the build given to attendees of Microsoft's Windows Hardware Engineering Conference 2004 in Seattle, Washington, held between 4–7 May, making it one of the only two pre-reset Longhorn builds that received a widespread release by Microsoft, the other being build 4051. It is widely considered to be one of the most notable pre-reset builds of Longhorn. Having been released publicly, it is also one of the several Longhorn builds that has a timebomb set to evaluation mode that triggers after 180 days, and as such it can be installed on the current date. Once the timebomb is triggered, Windows immediately logs the user out and returns to the log on screen if the user tries to log on.