Recently the 180 Day trial of my development Windows 7 Embedded install expired. This necessitated that I attempt to reset the Grace Period.

The following seems to work;

• Open Command Prompt under Elevated Privileges
• Enter “slmgr.vbs /rearm” and press Enter
• Wait for the command to complete, and ok the dialog box
• Restart your system
• Windows should prompt that it is not genuine
• Open Command Prompt under Elevated Privileges again
• Enter “slmgr.vbs –atp” and press Enter
• Ok the Dialog Box
• Restart Windows
• Goto your System Properties
• The machine should now have 180 days once more