An antivirus is currently installed on this computer. Two or more antiviruses installed together can conflict with each other.
A firewall is currently installed on this computer. Two or more firewalls installed together can conflict with each other.</blockquote>
If you did not experience this issue before then you could try to re-install using this guide.
However, if it happened only once then I cannot see a serious issue.
If you do experience this issue again please come back and we will investigate it. No worries.