well-balanced, well-configured mult-layered defense is best
From MS-DOS 3.3, MS-DOS 6.22, from Windows 3.1 to WFW 3.11 to Windows 95-98SE, now to Windows 7 Pro.
Security for now: Windows 7 Firewall, Emsisoft AM, MSE [scan-only], SpywareBlaster, Ruiware/BillP combine
do you have windows setup media? insert your windows 8/8.1 setup media and run this from command prompt(admin)
this command assumes your setup media is drive K - change drive letter to suit your system..