Hello and welcome. Security Shield
is a rogue anti-spyware program from the same family as Security Tool. This rogue is installed through other malware and fake online anti-malware scanners. When installed, Security Shield will be configured to start automatically when Windows starts. Once started, it will perform a scan of your computer and state that there are numerous infections present on your computer. If you attempt, though, to remove any of these so-called infections the program will state that you first need to purchase it. In reality, all of the files it states are infections are legitimate Windows files. Therefore, do not manually delete any of the files it states are infections as you may cause Windows to not operate correctly.
Please follow our Removal Guide here Remove Security Shield or SecurityShield (Uninstall Guide)
You will move to the Automated Removal Instructions
After you completed that, post your scan log here,let me know how things are.
The log is automatically saved and can be viewed by clicking the Logs
tab in MBAM.
Copy and paste the contents of that report in your next reply. Be sure to post the complete log to include the top portion which shows MBAM's database version and your operating system.