SecurityTool protect your pc

The icon shaped like a shield with gears in it appeared on my desk top, my icons were all removed. As i tried to open control panel, the software took it over. I opened my email and it flashed and then the software took it over. I have a message that reads WARNING! 24 INFECTONS FOUND!!! I managed to look up a few of them up in files and folders, which did not find them. Now I have no control over my PC. THE SOFTWARE WANTS ME TO BUY THEIR PRODUCT TO REMOVE THESE IMAGINARY INFECTIONS. hOW DO I GET RID OF IT?
Judy

Download OTL by OldTimer to your Desktop.

• Close all windows and double click OTL.exe
  
• Click Run Scan and let the program run uninterrupted
  
• It will produce two logs for you, one will pop up - OTL.txt, the other will be saved on your Desktop - Extras.txt. Post both logs in this thread.
  
• You may need to use two posts to get it all.