How did you install Mcafee on your computer.
What kind of operating system you installed on your computer
What kinf of internet connection your using on your computer.
And for your kind information you wont be able to register it without internet connection.
Plz revert back with the information will guide you further.........
If you isatalled it through CD plz follow the steps below:-
Download the tool from Link below and save it on your desktop. http://download.mcafee.com/products/.../MSCPRXFIX.exe
Double-click MSCPRXFIX.exe on your Desktop.
After running the tool, restart the computer.
To check for updates, right-click the M icon in the system tray and select Updates.