hello, i need help…i downloaded avast and installed it today. my computer was working fine, but after i installed avast the computer doesnt let me shut down or open any applications. i do not know a lot about computers, anyone has any idea of what might be wrong? i had norton but since it expired i decided to get a free anti-virus…i did forget to uninstall norton before installing avast.
Norton is the culprit, almost certainly.
Any AV should be completely removed (uninstalled then applicable removal tool run) prior to installing a new AV.