How do I permanently remove Security Tool from my computer?

you can’t, why don’t you buy it?? it’s already on your computer :D

http://www.bleepingcomputer.com/virus-removal/remove-security-tool

go and download kaspersky and make an stratup image burn then do a scan its the best way to remop virus and normal scan can help u too,

Uninstall it.

Manually remove Security Tool
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Stop These Security Tool Processes (-> Task Manager)
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Security Tool.exe
uninstall.exe
4946550101.exe

Find and Delete These Security Tool Files: (Windows Explorer — Main Drive)
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%System Root%Samples
%User Profile%Local SettingsTemp
%Documents and Settings%All UsersStart MenuProgramsSecurityTool
%Documents and Settings%All UsersApplication DataSecurityTool
%UserProfile%Start MenuProgramsSecurity Tool.lnk
%UserProfile%Application Data49465501014946550101.bat
%UserProfile%Application Data49465501014946550101.cfg
%UserProfile%Application Data49465501014946550101.exe
%UserProfile%Application Data4946550101
%UserProfile%DesktopSecurity Tool.lnk
%Program Files%SecurityTool

Remove These Security Tool Registry Values: (START>RUN>regedit)
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HKEY_CURRENT_USERSoftwareMicrosoftWindowsCurrentVersionRun SecurityTool
HKEY_CURRENT_USERSoftwareVista Antivirus 2010
HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindowsCurrentVersionUninstallSecurityTool
HKEY_LOCAL_MACHINESOFTWARESecurityTool
77DC0B63-ff35-4ba9-8BE8-aa9EB676FA02
7897A556-0E82-49F4-8C80-D0983CBF0352
7F23592B-8F2C-4C08-83A8-BBE01BF9CC64
a791a998-ae9a-42cb-b833-45279b64dd30
AF4DA69B-E1D6-469A-855B-6445294857D4

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1. go to C:WindowsSystem32 folder, copy taskmgr.exe and rename copy to iexplore.exe . Run it.
(if you can’t, download process explorer, rename it to iexplore.exe and copy to usb disk. run from usb disk on infected pc). Stop numerical processes, like 235235623 . Note down their location.
2. Run hitman pro. Do a scan, activate (for free), remove what it finds. Reboot, Run it again. Repeat (1-2) again, till hitmanpro finds nothing.
3. Run Spyware Doctor, delete what it finds, If file, stopped at 1 is still there, rename and delete it.
Here a more detailed guide : http://www.2-viruses.com/remove-security-tool

Very similar to Wendy’s responce, but if going into the registry is a bit intense for you, I swear by this freeware program (meaning verified no spyware or virus, free to download and use, forever.)

http://download.cnet.com/Revo-Uninstaller/3000-2096_4-10687648.html?tag=contentMain;contentBody;1d

You will need to follow the first few steps of Wendy’s response as well by going into task manager and stopping the processes. If you have a problem with the program continuing to start itself back up, as many viruses do, you can also boot into safe mode.