1. Identify Live Security Platinum location / directory. Right click the Live Security Platinum icon / shortcut on your desktop and click properties. It usually stores at Application Data or ProgramData and in a folder which has filename of random characters (creepy).
2. Open IE (Internet Explorer). Enter 'http://live.
3. Download the file and move it to your desktop.
4. Run the file. If you're unable to run the file coz Live Security Platinum is blocking it, rename it to 'iexplore.exe' then try to run it.
5. Find the actual running file. Its name should be the same as the random characters as in step 1. Right click the file and choose 'kill process'.
6. Now go to its directory to delete the entire files. Example C:\ProgramData\The Random Characters as in Step 1. Delete the whole folder and you're done.
Okay by now little more or less you might doubt that your computer is not completely clean. You may download and install Malwarebytes Anti-Malware to clean up some malware or with any other reliable anti-spyware or anti-virus software.