Any screenshot would be able to help :-\
CraigB
4
Do you have Kaspersky installed ? looks like avast detected another antivirus on your computer and you cant have two AV’s on the one system.
Pondus
5
as Craig already said…no surprise when installing mutiple AV. 
this will give you a slow machine, mysterious windows errors and false detections
read reply from quietman7 here. http://www.bleepingcomputer.com/forums/topic186533.html
if you want a extra scanner, use Malwarebytes. www.malwarebytes.org
to make sure all conflicting files are gone, run removal tool for the AV you uninstall
tools found here. http://singularlabs.com/uninstallers/security-software/