You are evaluating or testing a Windows Operating System and need to extend the activation grace period to complete your evaluation or testing.
Extend or rearm the evaluation period. This process must be followed before the activation countdown reaches 0:
Right click “Command Prompt” and select “Run as administrator”:
Navigate to the C:\Windows\System32 folder and execute the following command.
cscript slmgr.vbs /rearm
Most documentation on this procedure references -rearm which works on Windows Vista and 7 but sometimes generates an error on certain Windows 2008 installations.
Restart your computer and verify the process worked:
Use the following command to verify the amount of time remaining before your evaluation period expires:
cscript slmgr.vbs /dli
For more information: