It is okay to have multiple anti-virus programs installed. Possibly not all that useful!
The issues result from having multiple scanners doing on-demand scanning (ie, scanning on the fly, so called 'real-time'). It can be a significant performance hit, they may intercept system calls in incompatible ways, and there is also the risk that one scanner will detect another as malware (since the behaviour of a scanning program can resemble the behaviour of a virus). So if you do install multiple anti-virus programs, no more than one should have any 'real-time' functionality enabled.
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