Posted 31 March 2009 - 05:25 PM
Using more than one anti-virus program is not advisable. The primary concern with doing so is due to conflicts that can arise when they are running in real-time mode simultaneously.
In contrast, using more than one anti-spyware program with or without real-time protection increases your protection coverage without causing the same kind of conflicts or affecting the stability of your system that can occur when using more than one anti-virus. Even if your anti-spyware programs are not running in real-time, the overlap of protection from using different signature databases will aid in detection and removal of more threats when scanning your system for malware.
No single product is 100% foolproof and can detect and remove all threats at any given time. The security community is in a constant state of change as new infections appear. Each vendor has its own definition of what constitutes malware and scanning your computer using different criteria will yield different results. The fact that each program has its own definition files means that some malware may be picked up by one that could be missed by another. Thus, a multi-layered defense using several anti-spyware products (including an effective firewall) to supplement your anti-virus combined with common sense and safe surfing habits provides the most complete protection.
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