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Is 2 antivirus running too many ??


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4 replies to this topic

#1 earlbear

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Posted 26 January 2011 - 10:34 AM

I saw on another site to run 2 antivirus programs , so I am running Avira and Avast , is this ok ? Then on another site it said only run ! so is 2 ok or should I only run 1 and if so , which one , Avira or Avast ?

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#2 Allan

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Posted 26 January 2011 - 10:35 AM

No, it is not okay. Pick one (either one) and uninstall the other.

#3 Sightless

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Posted 26 January 2011 - 04:38 PM

No, you should only ever have 1 anti-virus running at once.
I would choose Avast, but Avira is equally good, I just prefer Avast.

#4 NpaMA

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Posted 27 January 2011 - 06:21 AM

It's fine to have 2 "installed" just don't have them both running real-time protection. For example, I have several installed but only Avast running real time protection.

If more then 1 is running real-time protection, they can give false positives of each other or just hurt the performance of your PC.

#5 quietman7

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Posted 27 January 2011 - 09:13 AM

Using more than one anti-virus program is not advisable. Why? The primary concern with doing so is due to conflicts that can arise when they are running in real-time mode simultaneously and issues with Windows resource management. Even if one of them is disabled for use as a stand-alone scanner, it can affect the other and cause conflicts. Anti-virus software components insert themselves into the operating systems core and using more than one can cause instability, crash your computer, slow performance and waste system resources. When actively running in the background while connected to the Internet, they both may try to update their definition databases at the same time. As the programs compete for resources required to download the necessary files this often can result in sluggish system performance or unresponsive behavior.

Each anti-virus may interpret the activity of the other as suspicious behavior and there is a greater chance of them alerting you to a "False Positive". If one finds a virus or a suspicious file and then the other also finds the same, both programs will be competing over exclusive rights on dealing with that virus or suspicious file. Each anti-virus may attempt to remove the offending file and quarantine it at the same time resulting in a resource management issue as to which program gets permission to act first. If one anit-virus finds and quarantines the file before the other one does, then you encounter the problem of both wanting to scan each other's zipped or archived files and each reporting the other's quarantined contents. This can lead to a repetitive cycle of endless alerts that continually warn you that a threat has been found when that is not the case.

Anti-virus scanners use virus definitions to check for malware and these can include a fragment of the virus code which may be recognized by other anti-virus programs as the virus itself. Because of this, many anti-virus vendors encrypt their definitions so that they do not trigger a false alarm when scanned by other security programs. Other vendors do not encrypt their definitions and they can trigger false alarms when detected by the resident anti-virus. Further, dual installation is not always possible because most of the newer anti-virus programs will detect the presence of others and may insist they be removed prior to download and installation of another. If the installation does complete with another anti-virus already installed, you may encounter issues like system freezing, unresponsiveness or similar symptoms while trying to use it.

To avoid these problems, use only one anti-virus solution. Deciding which one to remove is your choice. Be aware that you may lose your subscription to that anti-virus program's virus definitions once you uninstall that software.

Anti-virus vendors recommend that you install and run only one anti-virus program at a timeYou can always supplement your anti-virus by performing an Online Virus Scan.
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