Hello,
It is advised not to install 2 Antivirus Softwares on the same machine as it could be a security risk in itself.
In general, it's not a good idea to have more than one antivirus program installed on your computer. Each program may interpret the actions of the other as viral, therefore giving you false warnings about virus-related activities.
There are also chances that 1 Antivirus may try to stop another Antivirus services from running.