SecurityTool is part of a family of malware known as Fake AVs, they are programs that imitate legitimate security programs and make up fake infections claiming your computer needs their “full” or “premium” protection to remove them, which will cost you money. These can be hard to remove and usually have to be killed, then cleaned with an anti-malware program.
Killing the program:
Step 1: Download RKill from http://www.bleepingcomputer.com/download/rkill/dl/10/
*If you cannot download it from there or it will not run, try downloading it from http://www.bleepingcomputer.com/download/rkill/dl/11/
Step 2: Run the “RKill.exe” or “iExplore.exe” to kill any rogue malware. If you get an error or dialogue claiming it is a virus, disregard it and run the program again, until no malware is active.
*Do not reboot your computer during or after running RKill
Removing the infection with Malwarebytes:
Step 1: Download Malwarebytes Anti-Malware from https://www.malwarebytes.org/mwb-download/
Step 2: Run the setup files and install Malwarebytes.
*When installing Malwarebytes you will have the option to enable a free 30 day trial of their premium service, this is not required.
Step 3: Click the ÔÇ£Scan NowÔÇØ button in green, if an update is available then click the ÔÇ£Update NowÔÇØ button in the bottom right. The scan will begin once the update is finished.
Step 4: The scan may take some time, depending on your computer and the number of infections, but once it is finished click the ÔÇ£Apply ActionsÔÇØ button in green.
Step 5: Malwarebytes may or may not request that you reboot your computer after it has removed the infections, if it does you may proceed to reboot.