The term SecurityCenter is merely the name for the user interface you see when you open it on your computer. Total Protection is the name for one of the several different software packages that one can install.
Unfortunately SecurityCenter always pops up a renewal notice for the full cost, something we have asked them to review for a long time now.
If you want to change products from the current one you purchase whatever you want at the price you want and add it to your account by signing into your account and then going to whatever product page.
If you are changing products it's best to uninstall the old one first, run the MCPR cleanup tool listed under Useful Links at the top of this page, reboot and then download and install the new one.
Any questions regarding renewals and account matters should be directed to Customer Service - a free phone call - also linked under Useful Links at the top of this page.
The only difference between the two is that McAfee Total protection comes with Online back up for 2 GB Quota whereas McAfee Security center doesn’t have this feature!