Installing two or more virus protections on my PC?

What are the advantages/disadvantages, if there are any.

I have avg, avast and mcafee installed on my PC and they are all free editions.

Installing two or more virus protections on my PC?nortonantivirus

there's a lot of conflict if you have two or more anti-virus softwares in your pc and in most cases they contradict rather than give you better protection. they also slows down your computer a lot since they are all programmed to run at startup. instead of three, just have an updated one.

Installing two or more virus protections on my PC?spyware

You don't ever want to install two antivirus programs. You will have serious conflict with your system. You can install three or four antispyware without conflict as one will find what the others miss. Just have the resources for the software.

Minddoctor, France
Any virus protections you have in your PC are for free TEMPORARY. You will have to choose one day to buy one.You do not need two anti-virus a good one is enough. Let me tell you that all free editions are not fully protected your PC. They are LIMITED editions. Please,if you think my answer helps you somehow, do not forget to rate it. As Microsoft Office, the anti-virus program allows you between 60 to 90 days of free trial.That is.
will run into conflicts and typically they will battle for resources and cause problems amongst each other. AVG and AVast work well with free editions and mcafee is a good pay for solution. Use 1 solution and preferrably one with firewall included as well
The use of 2 or more anti-virus programs at the same time can cause major conflicts. The 2 scanning engines will fight each other to scan every file that you read, write or execute which can cause a major computer slowdown. For the same reason, using 2 A-Vs can cause you to have less protection from the various malware, not more.

(Using an anti-spyware and a firewall with an anti-virus is good, however and is recommended)

You might consider choosing just one A-V and removing any others. (Keep Avast...hint, hint)
more than one anti virus on your pc is asking for trouble...they're not compatible with each other and will cause conflicts eventually...but you can have more than one anti spyware program installed