Yes, it is okay to have multiple programs but they could “beat up” on each other and reduce the performance of the machine. The best option is to have the best of breed in each area or have the program suite from a single vendor who should have tested the applications working together.
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Definitely not, it is not advisable to install multiple or more that 1 security software in your computer system. Remember that every antivirus software constantly scans the entire computer system for potential threats and this could really make your computer in a very slow condition. In addition, it would make your entire system crash because of the conflict between antimalware programs installed.