Windows Shield Center is a fake security application from the same family as: Windows Antispyware Solution, Windows Risk Eliminator, Windows Universal Tool, Windows Utility Tool, Windows Security & Control, Windows Optimization & Security, Windows System Optimizator, Windows Optimization Center, Privacy Corrector, Privacy Guard 2010. This rogue displays fake warning messages pushing users to buy a license.
If your PC is infected with Windows Shield Center use MBAM to remove the infection.