Can multiple anti virus software run at the same time?
You can have multiple antivirus applications on your computer; however, you may run into conflicts if more than one antivirus program is set up for active monitoring. In addition to conflicts such as computer errors, I recommend against having multiple antivirus programs in your computer’s start up folder because system performance can suffer.
For example, by default, all antivirus programs are set up to start automatically whenever your computer boots up. This is by design. After all, you want protection all the time without having to remember to launch your virus solution, right? When two or more antivirus programs are loaded at start up each one takes up its fair share of your computer’s resources. With multiple running programs, fewer resources are available for other processes. This results in a sluggish PC.
Virus scans and real time monitoring are two different things. Running a virus scan involves looking at the contents of the disk and the computer’s memory for viruses while real time monitoring is a process where the antivirus application is constantly scanning new downloads.
Having multiple real time monitors constantly scanning downloaded files gobbles up resources and can cause numerous computer errors including out of memory errors and system slowdowns.
While it’s true that each antivirus software developer has its own unique database of virus definitions and it may make sense to use several in an attempt to catch as many threats as possible, it’s not necessary to run them all at once.
Here’s a way that you can have it both ways.
First, decide which antivirus solution will be your primary application and which one will be used from time to time as added protection against computer viruses that your main application may have missed. For the main application, choose an antivirus program that features an extensive database of virus definitions and receives automatic updates frequently. If you’ve already installed your main antivirus program, you won’t need to do anything further with it.
For your backup applications, you can use either a commercial antispyware program or download one of the leading freebies. When installing the secondary applications, they will likely set themselves up to start automatically when you reboot. To get around this, you’ll need to go into the System Configuration utility and remove the secondary antivirus programs from the Startup folder. Go to Start, Run, and type in: msconfig. Click the Startup tab and find the application in the list. Remove the checkmark in the box.
This prevents multiple antivirus programs from running at once. Your computer is still protected because your default application automatically launches and actively protects your PC against viruses. Every week or so, you can manually launch secondary antivirus program, update its database of definitions, and run a virus scan.
While it’s possible that you may catch a virus that your main antivirus program missed using a secondary scanner, I doubt you’ll find that having multiple antivirus applications is necessary if you have one of the better antivirus applications set up as your main one. So long as you have a quality product with an extensive, continuously updated database, you should have more than adequate protection. In particular, products such as McAfee AntiVirus Plus, ParetoLogic AntiVirus Plus, and TrendMicro PC-cillin all provide exceptional protection.

