How To Run Windows 7 Without Activating It
So you have downloaded a legit RC of Windows 7 from Microsoft–sorry free release candidates went offline last night–or you have purchased your copy from Microsoft directly but don’t want to enter the activation key yet? You can easily extend your trial period by entering a single command into the command prompt.
Open up your command prompt and type in “slmgr -rearm”. This will extend your trial period to 30 days. As soon as those 30 days run up you can do it again.
Microsoft is allowing you to do this 3 times for a total of 120 days. The same trick worked in Vista and it looks like M$ has decided to leave it in Windows 7.
