September 6th, 2010 
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Why does having more than one virus scanning application on a computer cause a conflict?
Many people have told me that it is bad to have two virus scanners running or installed at once because they will conflict with one another. Why and how do virus scanners conflict with each other?
As a general rule of thumb, you need only one of each. It's what I do. A single, good anti-spyware solution, an anti-virus solution, and a single firewall and, in my opinion, you're good to go.
However, as I've noted elsewhere, there's no single anti-virus or anti-spyware program that will catch all viruses or spyware. So there is a case to be made for having more than one. But if you do, you need to be careful because they can, and often do, interfere with each other.
Anti-Virus
Most anti-virus programs operate in two modes:
•Scan: the utility examines memory and files on disk for traces of malware. This involves actually examining the contents each file for things that "look like" viruses.
•Monitor: often referred to as "real time" monitor, the anti virus program is continually running and scans files as they are downloaded to your machine, notifying you nearly immediately if the file you just received contains something that looks like a virus.
There's nothing at all wrong periodically running an anti-virus scan with more than one anti-virus program. The key here is that it's just a scan - it starts, it scans, and then it's done. There's no opportunity to come in to conflict with another anti-virus program.
Real time monitoring, on the other hand, is another story. When you install most anti-virus programs they often automatically install and enable their real-time monitors. Running two or more real-time anti-virus monitors at the same time is very likely to cause a conflict. That conflict could result in error messages, crashes of the anti-virus programs, or other types of failure.
So it's certainly OK to have more than one anti-virus program installed, and it can make sense to run a scan using a different program from time to time, but you must make sure you only have one real-time monitor enabled at a time.
"Running two or more real-time anti-virus monitors at the same time is very likely to cause a conflict."The simplest way to do so, as I mentioned earlier, is to rely on a single, good anti-virus program and make sure that its database of known viruses is continually being updated.
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Video: CAIR Rep Debates Body Scanners, Profiling on Fox
Why does the TSA need full body scanners when the existing rules weren't followed?
Current TSA procedures WERE NOT FOLLOWED in the BVD bomber case... If we are not complying with CURRENT rules and procedures, who thinks hundreds of millions MORE wasted dollars will improve screening?
Illusion of safety, illusion of activity, deliberate deception (us thinking the state is really out to protect us)
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