Lenovo 3000 C305 All-In-One - Manual (Page 8)

6 Windows7 Upgrade Instructions
Activation Method:
Follow the instructions below to activate the Windows7 operating system after
installation.
Attention: Be sure to activate the new Windows7 operating system within the time
showed in the "Control panel-system and security-system” window after upgrade.
1) Open the “Control panel-system and
security-system” window and click the
activation link.