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
and issues with Windows resource management. Even when 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, most anti-virus programs 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 time
You can always supplement your anti-virus by performing an Online Virus Scan
I have been disappointed with AVG ever since they made a decision in April 2010 to partner with LimeWire
and promote the use of peer-to-peer (P2P) file sharing
, a security risk which can make your system susceptible to a smörgåsbord of malware infections
, remote attacks, and exposure of personal information.
With the release of AVG 2011, there have been numerous complaints about issues and conflicts with other security tools like Malwarebytes' Anti-Malware. Unlike previous versions, AVG 2011 cannot be effectively disabled
to prevent it from interfering with other security tools...after restarting the computer, AVG re-enables all protections. Read these related discussions:
There have been reports of issues with the computer starting properly on 64-bit Windows sytems
for which AVG has had to release these fix instructions
There have also been reported problems with computers after using
new features like PC Analyzer
and PC Tuneup
which purport to fix registry errors in order to make the system more stable and various optimizing tools which can make changes to system settings.I do not recommend the routine use of registry cleaners/optimizers
as they are extremely powerful applications that can damage the Windows registry
by using aggressive cleaning routines and cause your computer to become unbootable. Using registry cleaning tools unnecessarily
could lead to disastrous effects on your operating system such as preventing it from booting properly. For routine use, the benefits to your computer are negligible while the potential risks
Even MajorGeeks, a popular download hosting site, has issued a Statement on AVG Free 2011
and has removed its Editor's Pick listing.
For these reasons, I no longer recommend AVG as a free alternative.Free Antivirus programs: (choose and install only one)
. I recommend any of the first three.