Today for some reason Avast blocked WindBot, so here is a simple and fast tutorial to fix it!
1) Open your Avast and click on Configuration
http://i.imgur.com/30BY5Ry.png
2) Open the Tab "Antivirus" (left side)
3) Scroll down to EXCLUSIONS and click on Browse
http://i.imgur.com/XsfEH46.png
4) Browse to your WindBot Folder,select it and press OK
http://i.imgur.com/NWs31bQ.png
5) Finish by pressing ADD
http://i.imgur.com/4KwMsfV.png
6) Done!!!!