The trouble comes in your system may be having the two antivirus programs. Remove the other antivirus program if you want to set up the Avira antivirus, although the selection is totally individual. After withdraw the other antivirus restart the system. Remove both the antivirus program and set up only Avira antivirus so that it will boot the Avira antivirus rescue cd you can also download from the link and set up on the system. It assists to recover your machine.