McAfee Internet Security won’t activate in Windows 7

Problem :

When you click on activate button, after some time the message appeared that ” Unsuccessful Activation”

Solution :

1.Click the Windows Button and type cmd.exe into the search bar.
2.Right-click cmd.exe in the search list, and select Run as Administrator.
3.Type the following text, then press ENTER:

c:\program files\mcafee\msc\mcoemmgr.exe /regserver

4.Right-click the M icon in your taskbar and select either Activate, Activate Now, Register, or Register Now.
5.Follow the instructions.

Source:McAfee Community