Number 1, you shouldn't have installed another AV until you removed the other one. So you tried add/remove programs? When you uninstall Avast it will pop up and ask you if you really want to remove it. If you have not got his far. uninstall the other AV then avast. If still acting funny. Download CCleaner. It has a third party uninstall program that may help. If none of these options work for you. Write to avast tech support. They will better be able to help you.
I took your advise and downloaded but my job gave me another corporate one free so I downloaded that. but avast cannot be removed whats going on? How can you put a file in your computer and it cannot be deleted.