If you cannot terminate the malicious process of LiveSecurity Platinum virus you may use the free application called Process Killer(Pkiller.exe)
This is a free application which can be downloadedfrom this link.
Rename pkiller.exe to iexplore.exe and then runiexplore.exe
This should help you terminate the malicious processof Live Security Platinum rogue. Then you may download any security applicationof your choice to remove this horrible virus from your PC.
More information with video guide - http://trojan-removal-guide.com/remove-live-security-platinum-virus-unambiguousl y/