Security Scan Plus is simply a tool that checks what security software you may need, it is installed optionally with some other software such as Adobe products and can be uninstalled in the normal manner via Control Panel > Programs.
To sort out your subscription problems it's probably best to contact Customer Service directly via Useful Links at the top of this page. The best way to contact them is either a toll-free phone call or online chat.
McAfee Security Scan Plus is a free diagnostic tool that ensures you are protected by actively checking your computer for up-to-date anti-virus, firewall, and web security software so you always know if your computer is safe. & not to confuse that with your regular McAfee Antivirus software as both are different
I happened to locate your McAfee account and found that you have 3 User McAfee Total protection good until the 2012 . So by now if you do not have the programs installed on the PC. Please follow the instructions here and reinstall the program and you should be alright . http://service.mcafee.com/faqdocument.aspx?id=TS100507