Antivirii 2011 is a rogue anti-virus program that scares people into paying for the bogus program to remove fake virus/malware threats. Just download Malwarebytes and run a full scan to clean this rogue off, If you can’t download it, reboot your computer is “Safe Mode with Networking”. As the computer is booting tap the “F8 key” continuously which should bring up the “Windows Advanced Options Menu” as shown below. Use your arrow keys to move to “Safe Mode with Networking” and press Enter key.
C:WINDOWSrandom named file.exe