Please follow the below prompts to complete the registration process.
Right click on the M icon on the system tray and select product setup.
From the options;
(i) Select the option "Create new Account" – If you do not have an account previously with McAfee
(ii) Select the option "login" – If you already have an account associated with McAfee and enter the credentials you used to activate your subscription and continue with the prompts.
Kindly report backwith the exact error message, if you come across any issues
May I know what is the computer;s operating system ?
And also your browser IE or firefox , so that I could suggest you a different step .