Hi, could you please try to install Anvi Smart Defender in safe mode with networking by reading the following steps?
1 Reboot your computer to safe mode with networking.
Windows XP and Windows 7
Press and hold the F8 key as computer starts but before Windows launches.
Note: If pressing and holding the F8 key only gets you a stuck key message, which means you failed to reach the Windows Advanced Options Menu, you should tap the F8 key continuously instead to get the screen.
Restart into Advanced Startup options menu. Click Troubleshoot button>Advanced options. Under the Advanced option, click Startup settings. Click on the "Restart" button. Restart into Startup Settings screen. Press 5 to boot in Safe Mode with Networking.
2 Download and Install the Anvi Smart Defender Anti-Malware software.
3 Install and Launch the program.