No. We highly recommend that only one antivirus program be installed on your computer. If you're un-satisfied with the antivirus program you currently have installed we suggest that it be uninstalled and a new program be installed. 

Having more than one antivirus on the computer can cause a number of different issues. Often the most common issue being a confliction between the different antivirus programs causing your computer to become unprotected.
 
Although we only recommend on antivirus program on the computer it's more than acceptable to have one ore more spyware or malware protection programs on the computer.