There are many different ways to remove Live Security Platinum. Like with most malware, many programs will be blocked from running. In most cases you will be able to boot into safe mode and do a system restore. This works in about half of all cases.
For manual removal tips of this you can view any of the following sites
http://www.removevirus.org/live-security-platinum
http://www.2-viruses.com/remove-live-security-platinum
http://www.pctechguide.com/virus-removal/how-to-remove-live-security-platinum
Free Antivirus Clients to Help you remove this threat
Malwarebytes
Avast
AVG
Microsoft Security Essentials
All the above offer a free fully functional antivirus client. Paid clients offer more protection then free so if you like one of the above we encourage you to make a purchase.
Live Security Platinum